[core] os.path -> Path (#10654)

Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>
Co-authored-by: J. Nick Koston <nick@koston.org>
Co-authored-by: J. Nick Koston <nick@home-assistant.io>

esphome/__main__.py

@@ -6,6 +6,7 @@ import getpass
 import importlib
 import logging
 import os
+from pathlib import Path
 import re
 import sys
 import time
@@ -538,7 +539,10 @@ def upload_program(
 
     remote_port = int(ota_conf[CONF_PORT])
     password = ota_conf.get(CONF_PASSWORD, "")
-    binary = args.file if getattr(args, "file", None) is not None else CORE.firmware_bin
+    if getattr(args, "file", None) is not None:
+        binary = Path(args.file)
+    else:
+        binary = CORE.firmware_bin
 
     # MQTT address resolution
     if get_port_type(host) in ("MQTT", "MQTTIP"):
@@ -605,7 +609,7 @@ def clean_mqtt(config: ConfigType, args: ArgsProtocol) -> int | None:
 def command_wizard(args: ArgsProtocol) -> int | None:
     from esphome import wizard
 
-    return wizard.wizard(args.configuration)
+    return wizard.wizard(Path(args.configuration))
 
 
 def command_config(args: ArgsProtocol, config: ConfigType) -> int | None:
@@ -818,7 +822,8 @@ def command_idedata(args: ArgsProtocol, config: ConfigType) -> int:
 
 
 def command_rename(args: ArgsProtocol, config: ConfigType) -> int | None:
-    for c in args.name:
+    new_name = args.name
+    for c in new_name:
         if c not in ALLOWED_NAME_CHARS:
             print(
                 color(
@@ -829,8 +834,7 @@ def command_rename(args: ArgsProtocol, config: ConfigType) -> int | None:
             )
             return 1
     # Load existing yaml file
-    with open(CORE.config_path, mode="r+", encoding="utf-8") as raw_file:
+    raw_contents = CORE.config_path.read_text(encoding="utf-8")
-        raw_contents = raw_file.read()
 
     yaml = yaml_util.load_yaml(CORE.config_path)
     if CONF_ESPHOME not in yaml or CONF_NAME not in yaml[CONF_ESPHOME]:
@@ -845,7 +849,7 @@ def command_rename(args: ArgsProtocol, config: ConfigType) -> int | None:
     if match is None:
         new_raw = re.sub(
             rf"name:\s+[\"']?{old_name}[\"']?",
-            f'name: "{args.name}"',
+            f'name: "{new_name}"',
             raw_contents,
         )
     else:
@@ -865,29 +869,28 @@ def command_rename(args: ArgsProtocol, config: ConfigType) -> int | None:
 
         new_raw = re.sub(
             rf"^(\s+{match.group(1)}):\s+[\"']?{old_name}[\"']?",
-            f'\\1: "{args.name}"',
+            f'\\1: "{new_name}"',
             raw_contents,
             flags=re.MULTILINE,
         )
 
-    new_path = os.path.join(CORE.config_dir, args.name + ".yaml")
+    new_path: Path = CORE.config_dir / (new_name + ".yaml")
     print(
-        f"Updating {color(AnsiFore.CYAN, CORE.config_path)} to {color(AnsiFore.CYAN, new_path)}"
+        f"Updating {color(AnsiFore.CYAN, str(CORE.config_path))} to {color(AnsiFore.CYAN, str(new_path))}"
     )
     print()
 
-    with open(new_path, mode="w", encoding="utf-8") as new_file:
+    new_path.write_text(new_raw, encoding="utf-8")
-        new_file.write(new_raw)
 
-    rc = run_external_process("esphome", "config", new_path)
+    rc = run_external_process("esphome", "config", str(new_path))
     if rc != 0:
         print(color(AnsiFore.BOLD_RED, "Rename failed. Reverting changes."))
-        os.remove(new_path)
+        new_path.unlink()
         return 1
 
     cli_args = [
         "run",
-        new_path,
+        str(new_path),
         "--no-logs",
         "--device",
         CORE.address,
@@ -901,11 +904,11 @@ def command_rename(args: ArgsProtocol, config: ConfigType) -> int | None:
     except KeyboardInterrupt:
         rc = 1
     if rc != 0:
-        os.remove(new_path)
+        new_path.unlink()
         return 1
 
     if CORE.config_path != new_path:
-        os.remove(CORE.config_path)
+        CORE.config_path.unlink()
 
     print(color(AnsiFore.BOLD_GREEN, "SUCCESS"))
     print()
@@ -1262,7 +1265,8 @@ def run_esphome(argv):
     _LOGGER.info("ESPHome %s", const.__version__)
 
     for conf_path in args.configuration:
-        if any(os.path.basename(conf_path) == x for x in SECRETS_FILES):
+        conf_path = Path(conf_path)
+        if any(conf_path.name == x for x in SECRETS_FILES):
             _LOGGER.warning("Skipping secrets file %s", conf_path)
             continue
 

esphome/build_gen/platformio.py

@@ -1,5 +1,3 @@
-import os
-
 from esphome.const import __version__
 from esphome.core import CORE
 from esphome.helpers import mkdir_p, read_file, write_file_if_changed
@@ -63,7 +61,7 @@ def write_ini(content):
     update_storage_json()
     path = CORE.relative_build_path("platformio.ini")
 
-    if os.path.isfile(path):
+    if path.is_file():
         text = read_file(path)
         content_format = find_begin_end(
             text, INI_AUTO_GENERATE_BEGIN, INI_AUTO_GENERATE_END

esphome/components/esp32/__init__.py

@@ -37,7 +37,7 @@ from esphome.const import (
 )
 from esphome.core import CORE, HexInt, TimePeriod
 import esphome.final_validate as fv
-from esphome.helpers import copy_file_if_changed, mkdir_p, write_file_if_changed
+from esphome.helpers import copy_file_if_changed, write_file_if_changed
 from esphome.types import ConfigType
 from esphome.writer import clean_cmake_cache
 
@@ -272,14 +272,14 @@ def add_idf_component(
         }
 
 
-def add_extra_script(stage: str, filename: str, path: str):
+def add_extra_script(stage: str, filename: str, path: Path):
     """Add an extra script to the project."""
     key = f"{stage}:{filename}"
     if add_extra_build_file(filename, path):
         cg.add_platformio_option("extra_scripts", [key])
 
 
-def add_extra_build_file(filename: str, path: str) -> bool:
+def add_extra_build_file(filename: str, path: Path) -> bool:
     """Add an extra build file to the project."""
     if filename not in CORE.data[KEY_ESP32][KEY_EXTRA_BUILD_FILES]:
         CORE.data[KEY_ESP32][KEY_EXTRA_BUILD_FILES][filename] = {
@@ -818,7 +818,7 @@ async def to_code(config):
     add_extra_script(
         "post",
         "post_build.py",
-        os.path.join(os.path.dirname(__file__), "post_build.py.script"),
+        Path(__file__).parent / "post_build.py.script",
     )
 
     if conf[CONF_TYPE] == FRAMEWORK_ESP_IDF:
@@ -1040,7 +1040,7 @@ def _write_sdkconfig():
 
 
 def _write_idf_component_yml():
-    yml_path = Path(CORE.relative_build_path("src/idf_component.yml"))
+    yml_path = CORE.relative_build_path("src/idf_component.yml")
     if CORE.data[KEY_ESP32][KEY_COMPONENTS]:
         components: dict = CORE.data[KEY_ESP32][KEY_COMPONENTS]
         dependencies = {}
@@ -1058,8 +1058,8 @@ def _write_idf_component_yml():
         contents = ""
     if write_file_if_changed(yml_path, contents):
         dependencies_lock = CORE.relative_build_path("dependencies.lock")
-        if os.path.isfile(dependencies_lock):
+        if dependencies_lock.is_file():
-            os.remove(dependencies_lock)
+            dependencies_lock.unlink()
         clean_cmake_cache()
 
 
@@ -1093,14 +1093,13 @@ def copy_files():
     )
 
     for file in CORE.data[KEY_ESP32][KEY_EXTRA_BUILD_FILES].values():
-        if file[KEY_PATH].startswith("http"):
+        name: str = file[KEY_NAME]
+        path: Path = file[KEY_PATH]
+        if str(path).startswith("http"):
             import requests
 
-            mkdir_p(CORE.relative_build_path(os.path.dirname(file[KEY_NAME])))
+            CORE.relative_build_path(name).parent.mkdir(parents=True, exist_ok=True)
-            with open(CORE.relative_build_path(file[KEY_NAME]), "wb") as f:
+            content = requests.get(path, timeout=30).content
-                f.write(requests.get(file[KEY_PATH], timeout=30).content)
+            CORE.relative_build_path(name).write_bytes(content)
         else:
-            copy_file_if_changed(
+            copy_file_if_changed(path, CORE.relative_build_path(name))
-                file[KEY_PATH],
-                CORE.relative_build_path(file[KEY_NAME]),
-            )

esphome/components/esp32_hosted/__init__.py

@@ -1,4 +1,5 @@
 import os
+from pathlib import Path
 
 from esphome import pins
 from esphome.components import esp32
@@ -97,5 +98,5 @@ async def to_code(config):
     esp32.add_extra_script(
         "post",
         "esp32_hosted.py",
-        os.path.join(os.path.dirname(__file__), "esp32_hosted.py.script"),
+        Path(__file__).parent / "esp32_hosted.py.script",
     )

esphome/components/esp8266/__init__.py

@@ -1,5 +1,5 @@
 import logging
-import os
+from pathlib import Path
 
 import esphome.codegen as cg
 import esphome.config_validation as cv
@@ -259,8 +259,8 @@ async def to_code(config):
 
 # Called by writer.py
 def copy_files():
-    dir = os.path.dirname(__file__)
+    dir = Path(__file__).parent
-    post_build_file = os.path.join(dir, "post_build.py.script")
+    post_build_file = dir / "post_build.py.script"
     copy_file_if_changed(
         post_build_file,
         CORE.relative_build_path("post_build.py"),

esphome/components/font/__init__.py

@@ -3,7 +3,6 @@ import functools
 import hashlib
 from itertools import accumulate
 import logging
-import os
 from pathlib import Path
 import re
 
@@ -38,6 +37,7 @@ from esphome.const import (
 )
 from esphome.core import CORE, HexInt
 from esphome.helpers import cpp_string_escape
+from esphome.types import ConfigType
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -253,11 +253,11 @@ def validate_truetype_file(value):
     return CORE.relative_config_path(cv.file_(value))
 
 
-def add_local_file(value):
+def add_local_file(value: ConfigType) -> ConfigType:
     if value in FONT_CACHE:
         return value
-    path = value[CONF_PATH]
+    path = Path(value[CONF_PATH])
-    if not os.path.isfile(path):
+    if not path.is_file():
         raise cv.Invalid(f"File '{path}' not found.")
     FONT_CACHE[value] = path
     return value
@@ -318,7 +318,7 @@ def download_gfont(value):
         external_files.compute_local_file_dir(DOMAIN)
         / f"{value[CONF_FAMILY]}@{value[CONF_WEIGHT]}@{value[CONF_ITALIC]}@v1.ttf"
     )
-    if not external_files.is_file_recent(str(path), value[CONF_REFRESH]):
+    if not external_files.is_file_recent(path, value[CONF_REFRESH]):
         _LOGGER.debug("download_gfont: path=%s", path)
         try:
             req = requests.get(url, timeout=external_files.NETWORK_TIMEOUT)

esphome/components/libretiny/__init__.py

@@ -1,6 +1,5 @@
 import json
 import logging
-from os.path import dirname, isfile, join
 
 import esphome.codegen as cg
 import esphome.config_validation as cv
@@ -24,6 +23,7 @@ from esphome.const import (
     __version__,
 )
 from esphome.core import CORE
+from esphome.storage_json import StorageJSON
 
 from . import gpio  # noqa
 from .const import (
@@ -129,7 +129,7 @@ def only_on_family(*, supported=None, unsupported=None):
     return validator_
 
 
-def get_download_types(storage_json=None):
+def get_download_types(storage_json: StorageJSON = None):
     types = [
         {
             "title": "UF2 package (recommended)",
@@ -139,11 +139,11 @@ def get_download_types(storage_json=None):
         },
     ]
 
-    build_dir = dirname(storage_json.firmware_bin_path)
+    build_dir = storage_json.firmware_bin_path.parent
-    outputs = join(build_dir, "firmware.json")
+    outputs = build_dir / "firmware.json"
-    if not isfile(outputs):
+    if not outputs.is_file():
         return types
-    with open(outputs, encoding="utf-8") as f:
+    with outputs.open(encoding="utf-8") as f:
         outputs = json.load(f)
     for output in outputs:
         if not output["public"]:

esphome/components/rp2040/__init__.py

@@ -1,5 +1,5 @@
 import logging
-import os
+from pathlib import Path
 from string import ascii_letters, digits
 
 import esphome.codegen as cg
@@ -19,7 +19,7 @@ from esphome.const import (
     ThreadModel,
 )
 from esphome.core import CORE, CoroPriority, EsphomeError, coroutine_with_priority
-from esphome.helpers import copy_file_if_changed, mkdir_p, read_file, write_file
+from esphome.helpers import copy_file_if_changed, read_file, write_file_if_changed
 
 from .const import KEY_BOARD, KEY_PIO_FILES, KEY_RP2040, rp2040_ns
 
@@ -221,18 +221,18 @@ def generate_pio_files() -> bool:
     if not files:
         return False
     for key, data in files.items():
-        pio_path = CORE.relative_build_path(f"src/pio/{key}.pio")
+        pio_path = CORE.build_path / "src" / "pio" / f"{key}.pio"
-        mkdir_p(os.path.dirname(pio_path))
+        pio_path.parent.mkdir(parents=True, exist_ok=True)
-        write_file(pio_path, data)
+        write_file_if_changed(pio_path, data)
         includes.append(f"pio/{key}.pio.h")
 
-    write_file(
+    write_file_if_changed(
         CORE.relative_build_path("src/pio_includes.h"),
         "#pragma once\n" + "\n".join([f'#include "{include}"' for include in includes]),
     )
 
-    dir = os.path.dirname(__file__)
+    dir = Path(__file__).parent
-    build_pio_file = os.path.join(dir, "build_pio.py.script")
+    build_pio_file = dir / "build_pio.py.script"
     copy_file_if_changed(
         build_pio_file,
         CORE.relative_build_path("build_pio.py"),
@@ -243,8 +243,8 @@ def generate_pio_files() -> bool:
 
 # Called by writer.py
 def copy_files():
-    dir = os.path.dirname(__file__)
+    dir = Path(__file__).parent
-    post_build_file = os.path.join(dir, "post_build.py.script")
+    post_build_file = dir / "post_build.py.script"
     copy_file_if_changed(
         post_build_file,
         CORE.relative_build_path("post_build.py"),
@@ -252,4 +252,4 @@ def copy_files():
     if generate_pio_files():
         path = CORE.relative_src_path("esphome.h")
         content = read_file(path).rstrip("\n")
-        write_file(path, content + '\n#include "pio_includes.h"\n')
+        write_file_if_changed(path, content + '\n#include "pio_includes.h"\n')

esphome/config_validation.py

@@ -15,7 +15,7 @@ from ipaddress import (
     ip_network,
 )
 import logging
-import os
+from pathlib import Path
 import re
 from string import ascii_letters, digits
 import uuid as uuid_
@@ -1609,34 +1609,32 @@ def dimensions(value):
     return dimensions([match.group(1), match.group(2)])
 
 
-def directory(value):
+def directory(value: object) -> Path:
     value = string(value)
     path = CORE.relative_config_path(value)
 
-    if not os.path.exists(path):
+    if not path.exists():
         raise Invalid(
-            f"Could not find directory '{path}'. Please make sure it exists (full path: {os.path.abspath(path)})."
+            f"Could not find directory '{path}'. Please make sure it exists (full path: {path.resolve()})."
         )
-    if not os.path.isdir(path):
+    if not path.is_dir():
         raise Invalid(
-            f"Path '{path}' is not a directory (full path: {os.path.abspath(path)})."
+            f"Path '{path}' is not a directory (full path: {path.resolve()})."
         )
-    return value
+    return path
 
 
-def file_(value):
+def file_(value: object) -> Path:
     value = string(value)
     path = CORE.relative_config_path(value)
 
-    if not os.path.exists(path):
+    if not path.exists():
         raise Invalid(
-            f"Could not find file '{path}'. Please make sure it exists (full path: {os.path.abspath(path)})."
+            f"Could not find file '{path}'. Please make sure it exists (full path: {path.resolve()})."
         )
-    if not os.path.isfile(path):
+    if not path.is_file():
-        raise Invalid(
+        raise Invalid(f"Path '{path}' is not a file (full path: {path.resolve()}).")
-            f"Path '{path}' is not a file (full path: {os.path.abspath(path)})."
+    return path
-        )
-    return value
 
 
 ENTITY_ID_CHARACTERS = "abcdefghijklmnopqrstuvwxyz0123456789_"

esphome/core/__init__.py

@@ -3,6 +3,7 @@ from contextlib import contextmanager
 import logging
 import math
 import os
+from pathlib import Path
 import re
 from typing import TYPE_CHECKING
 
@@ -383,7 +384,7 @@ class DocumentLocation:
 
     @classmethod
     def from_mark(cls, mark):
-        return cls(mark.name, mark.line, mark.column)
+        return cls(str(mark.name), mark.line, mark.column)
 
     def __str__(self):
         return f"{self.document} {self.line}:{self.column}"
@@ -538,9 +539,9 @@ class EsphomeCore:
         # The first key to this dict should always be the integration name
         self.data = {}
         # The relative path to the configuration YAML
-        self.config_path: str | None = None
+        self.config_path: Path | None = None
         # The relative path to where all build files are stored
-        self.build_path: str | None = None
+        self.build_path: Path | None = None
         # The validated configuration, this is None until the config has been validated
         self.config: ConfigType | None = None
         # The pending tasks in the task queue (mostly for C++ generation)
@@ -664,43 +665,46 @@ class EsphomeCore:
         return None
 
     @property
-    def config_dir(self):
+    def config_dir(self) -> Path:
-        return os.path.abspath(os.path.dirname(self.config_path))
+        if self.config_path.is_dir():
+            return self.config_path.absolute()
+        return self.config_path.absolute().parent
 
     @property
-    def data_dir(self):
+    def data_dir(self) -> Path:
         if is_ha_addon():
-            return os.path.join("/data")
+            return Path("/data")
         if "ESPHOME_DATA_DIR" in os.environ:
-            return get_str_env("ESPHOME_DATA_DIR", None)
+            return Path(get_str_env("ESPHOME_DATA_DIR", None))
         return self.relative_config_path(".esphome")
 
     @property
-    def config_filename(self):
+    def config_filename(self) -> str:
-        return os.path.basename(self.config_path)
+        return self.config_path.name
 
-    def relative_config_path(self, *path):
+    def relative_config_path(self, *path: str | Path) -> Path:
-        path_ = os.path.expanduser(os.path.join(*path))
+        path_ = Path(*path).expanduser()
-        return os.path.join(self.config_dir, path_)
+        return self.config_dir / path_
 
-    def relative_internal_path(self, *path: str) -> str:
+    def relative_internal_path(self, *path: str | Path) -> Path:
-        return os.path.join(self.data_dir, *path)
+        path_ = Path(*path).expanduser()
+        return self.data_dir / path_
 
-    def relative_build_path(self, *path):
+    def relative_build_path(self, *path: str | Path) -> Path:
-        path_ = os.path.expanduser(os.path.join(*path))
+        path_ = Path(*path).expanduser()
-        return os.path.join(self.build_path, path_)
+        return self.build_path / path_
 
-    def relative_src_path(self, *path):
+    def relative_src_path(self, *path: str | Path) -> Path:
         return self.relative_build_path("src", *path)
 
-    def relative_pioenvs_path(self, *path):
+    def relative_pioenvs_path(self, *path: str | Path) -> Path:
         return self.relative_build_path(".pioenvs", *path)
 
-    def relative_piolibdeps_path(self, *path):
+    def relative_piolibdeps_path(self, *path: str | Path) -> Path:
         return self.relative_build_path(".piolibdeps", *path)
 
     @property
-    def firmware_bin(self):
+    def firmware_bin(self) -> Path:
         if self.is_libretiny:
             return self.relative_pioenvs_path(self.name, "firmware.uf2")
         return self.relative_pioenvs_path(self.name, "firmware.bin")

esphome/core/config.py

@@ -136,21 +136,21 @@ def validate_ids_and_references(config: ConfigType) -> ConfigType:
     return config
 
 
-def valid_include(value):
+def valid_include(value: str) -> str:
     # Look for "<...>" includes
     if value.startswith("<") and value.endswith(">"):
         return value
     try:
-        return cv.directory(value)
+        return str(cv.directory(value))
     except cv.Invalid:
         pass
-    value = cv.file_(value)
+    path = cv.file_(value)
-    _, ext = os.path.splitext(value)
+    ext = path.suffix
     if ext not in VALID_INCLUDE_EXTS:
         raise cv.Invalid(
             f"Include has invalid file extension {ext} - valid extensions are {', '.join(VALID_INCLUDE_EXTS)}"
         )
-    return value
+    return str(path)
 
 
 def valid_project_name(value: str):
@@ -311,9 +311,9 @@ def preload_core_config(config, result) -> str:
     CORE.data[KEY_CORE] = {}
 
     if CONF_BUILD_PATH not in conf:
-        build_path = get_str_env("ESPHOME_BUILD_PATH", "build")
+        build_path = Path(get_str_env("ESPHOME_BUILD_PATH", "build"))
-        conf[CONF_BUILD_PATH] = os.path.join(build_path, CORE.name)
+        conf[CONF_BUILD_PATH] = str(build_path / CORE.name)
-    CORE.build_path = CORE.relative_internal_path(conf[CONF_BUILD_PATH])
+    CORE.build_path = CORE.data_dir / conf[CONF_BUILD_PATH]
 
     target_platforms = []
 
@@ -339,12 +339,12 @@ def preload_core_config(config, result) -> str:
     return target_platforms[0]
 
 
-def include_file(path, basename):
+def include_file(path: Path, basename: Path):
-    parts = basename.split(os.path.sep)
+    parts = basename.parts
     dst = CORE.relative_src_path(*parts)
     copy_file_if_changed(path, dst)
 
-    _, ext = os.path.splitext(path)
+    ext = path.suffix
     if ext in [".h", ".hpp", ".tcc"]:
         # Header, add include statement
         cg.add_global(cg.RawStatement(f'#include "{basename}"'))
@@ -377,18 +377,18 @@ async def add_arduino_global_workaround():
 
 
 @coroutine_with_priority(CoroPriority.FINAL)
-async def add_includes(includes):
+async def add_includes(includes: list[str]) -> None:
     # Add includes at the very end, so that the included files can access global variables
     for include in includes:
         path = CORE.relative_config_path(include)
-        if os.path.isdir(path):
+        if path.is_dir():
             # Directory, copy tree
             for p in walk_files(path):
-                basename = os.path.relpath(p, os.path.dirname(path))
+                basename = p.relative_to(path.parent)
                 include_file(p, basename)
         else:
             # Copy file
-            basename = os.path.basename(path)
+            basename = Path(path.name)
             include_file(path, basename)
 
 

esphome/dashboard/core.py

@@ -7,7 +7,6 @@ from dataclasses import dataclass
 from functools import partial
 import json
 import logging
-from pathlib import Path
 import threading
 from typing import Any
 
@@ -108,7 +107,7 @@ class ESPHomeDashboard:
         await self.loop.run_in_executor(None, self.load_ignored_devices)
 
     def load_ignored_devices(self) -> None:
-        storage_path = Path(ignored_devices_storage_path())
+        storage_path = ignored_devices_storage_path()
         try:
             with storage_path.open("r", encoding="utf-8") as f_handle:
                 data = json.load(f_handle)
@@ -117,7 +116,7 @@ class ESPHomeDashboard:
             pass
 
     def save_ignored_devices(self) -> None:
-        storage_path = Path(ignored_devices_storage_path())
+        storage_path = ignored_devices_storage_path()
         with storage_path.open("w", encoding="utf-8") as f_handle:
             json.dump(
                 {"ignored_devices": sorted(self.ignored_devices)}, indent=2, fp=f_handle

esphome/dashboard/entries.py

@@ -5,7 +5,7 @@ from collections import defaultdict
 from dataclasses import dataclass
 from functools import lru_cache
 import logging
-import os
+from pathlib import Path
 from typing import TYPE_CHECKING, Any
 
 from esphome import const, util
@@ -287,12 +287,12 @@ class DashboardEntries:
         for file in util.list_yaml_files([self._config_dir]):
             try:
                 # Prefer the json storage path if it exists
-                stat = os.stat(ext_storage_path(os.path.basename(file)))
+                stat = ext_storage_path(file.name).stat()
             except OSError:
                 try:
                     # Fallback to the yaml file if the storage
                     # file does not exist or could not be generated
-                    stat = os.stat(file)
+                    stat = file.stat()
                 except OSError:
                     # File was deleted, ignore
                     continue
@@ -329,10 +329,10 @@ class DashboardEntry:
         "_to_dict",
     )
 
-    def __init__(self, path: str, cache_key: DashboardCacheKeyType) -> None:
+    def __init__(self, path: Path, cache_key: DashboardCacheKeyType) -> None:
         """Initialize the DashboardEntry."""
         self.path = path
-        self.filename: str = os.path.basename(path)
+        self.filename: str = path.name
         self._storage_path = ext_storage_path(self.filename)
         self.cache_key = cache_key
         self.storage: StorageJSON | None = None
@@ -365,7 +365,7 @@ class DashboardEntry:
                 "loaded_integrations": sorted(self.loaded_integrations),
                 "deployed_version": self.update_old,
                 "current_version": self.update_new,
-                "path": self.path,
+                "path": str(self.path),
                 "comment": self.comment,
                 "address": self.address,
                 "web_port": self.web_port,

esphome/dashboard/settings.py

@@ -27,7 +27,7 @@ class DashboardSettings:
 
     def __init__(self) -> None:
         """Initialize the dashboard settings."""
-        self.config_dir: str = ""
+        self.config_dir: Path = None
         self.password_hash: str = ""
         self.username: str = ""
         self.using_password: bool = False
@@ -45,10 +45,10 @@ class DashboardSettings:
             self.using_password = bool(password)
         if self.using_password:
             self.password_hash = password_hash(password)
-        self.config_dir = args.configuration
+        self.config_dir = Path(args.configuration)
-        self.absolute_config_dir = Path(self.config_dir).resolve()
+        self.absolute_config_dir = self.config_dir.resolve()
         self.verbose = args.verbose
-        CORE.config_path = os.path.join(self.config_dir, ".")
+        CORE.config_path = self.config_dir / "."
 
     @property
     def relative_url(self) -> str:
@@ -81,9 +81,9 @@ class DashboardSettings:
         # Compare password in constant running time (to prevent timing attacks)
         return hmac.compare_digest(self.password_hash, password_hash(password))
 
-    def rel_path(self, *args: Any) -> str:
+    def rel_path(self, *args: Any) -> Path:
         """Return a path relative to the ESPHome config folder."""
-        joined_path = os.path.join(self.config_dir, *args)
+        joined_path = self.config_dir / Path(*args)
         # Raises ValueError if not relative to ESPHome config folder
-        Path(joined_path).resolve().relative_to(self.absolute_config_dir)
+        joined_path.resolve().relative_to(self.absolute_config_dir)
         return joined_path

esphome/dashboard/util/file.py

@@ -1,63 +0,0 @@
-import logging
-import os
-from pathlib import Path
-import tempfile
-
-_LOGGER = logging.getLogger(__name__)
-
-
-def write_utf8_file(
-    filename: Path,
-    utf8_str: str,
-    private: bool = False,
-) -> None:
-    """Write a file and rename it into place.
-
-    Writes all or nothing.
-    """
-    write_file(filename, utf8_str.encode("utf-8"), private)
-
-
-# from https://github.com/home-assistant/core/blob/dev/homeassistant/util/file.py
-def write_file(
-    filename: Path,
-    utf8_data: bytes,
-    private: bool = False,
-) -> None:
-    """Write a file and rename it into place.
-
-    Writes all or nothing.
-    """
-
-    tmp_filename = ""
-    missing_fchmod = False
-    try:
-        # Modern versions of Python tempfile create this file with mode 0o600
-        with tempfile.NamedTemporaryFile(
-            mode="wb", dir=os.path.dirname(filename), delete=False
-        ) as fdesc:
-            fdesc.write(utf8_data)
-            tmp_filename = fdesc.name
-            if not private:
-                try:
-                    os.fchmod(fdesc.fileno(), 0o644)
-                except AttributeError:
-                    # os.fchmod is not available on Windows
-                    missing_fchmod = True
-
-        os.replace(tmp_filename, filename)
-        if missing_fchmod:
-            os.chmod(filename, 0o644)
-    finally:
-        if os.path.exists(tmp_filename):
-            try:
-                os.remove(tmp_filename)
-            except OSError as err:
-                # If we are cleaning up then something else went wrong, so
-                # we should suppress likely follow-on errors in the cleanup
-                _LOGGER.error(
-                    "File replacement cleanup failed for %s while saving %s: %s",
-                    tmp_filename,
-                    filename,
-                    err,
-                )

esphome/dashboard/web_server.py

@@ -49,10 +49,10 @@ from esphome.storage_json import (
 from esphome.util import get_serial_ports, shlex_quote
 from esphome.yaml_util import FastestAvailableSafeLoader
 
+from ..helpers import write_file
 from .const import DASHBOARD_COMMAND
 from .core import DASHBOARD, ESPHomeDashboard
 from .entries import UNKNOWN_STATE, DashboardEntry, entry_state_to_bool
-from .util.file import write_file
 from .util.subprocess import async_run_system_command
 from .util.text import friendly_name_slugify
 
@@ -581,7 +581,7 @@ class WizardRequestHandler(BaseHandler):
         destination = settings.rel_path(filename)
 
         # Check if destination file already exists
-        if os.path.exists(destination):
+        if destination.exists():
             self.set_status(409)  # Conflict status code
             self.set_header("content-type", "application/json")
             self.write(
@@ -798,10 +798,9 @@ class DownloadBinaryRequestHandler(BaseHandler):
             "download",
             f"{storage_json.name}-{file_name}",
         )
-        path = os.path.dirname(storage_json.firmware_bin_path)
+        path = storage_json.firmware_bin_path.with_name(file_name)
-        path = os.path.join(path, file_name)
 
-        if not Path(path).is_file():
+        if not path.is_file():
             args = ["esphome", "idedata", settings.rel_path(configuration)]
             rc, stdout, _ = await async_run_system_command(args)
 
@@ -1016,7 +1015,7 @@ class EditRequestHandler(BaseHandler):
             return
 
         filename = settings.rel_path(configuration)
-        if Path(filename).resolve().parent != settings.absolute_config_dir:
+        if filename.resolve().parent != settings.absolute_config_dir:
             self.send_error(404)
             return
 
@@ -1039,10 +1038,6 @@ class EditRequestHandler(BaseHandler):
             self.set_status(404)
             return None
 
-    def _write_file(self, filename: str, content: bytes) -> None:
-        """Write a file with the given content."""
-        write_file(filename, content)
-
     @authenticated
     @bind_config
     async def post(self, configuration: str | None = None) -> None:
@@ -1052,12 +1047,12 @@ class EditRequestHandler(BaseHandler):
             return
 
         filename = settings.rel_path(configuration)
-        if Path(filename).resolve().parent != settings.absolute_config_dir:
+        if filename.resolve().parent != settings.absolute_config_dir:
             self.send_error(404)
             return
 
         loop = asyncio.get_running_loop()
-        await loop.run_in_executor(None, self._write_file, filename, self.request.body)
+        await loop.run_in_executor(None, write_file, filename, self.request.body)
         # Ensure the StorageJSON is updated as well
         DASHBOARD.entries.async_schedule_storage_json_update(filename)
         self.set_status(200)
@@ -1072,7 +1067,7 @@ class ArchiveRequestHandler(BaseHandler):
 
         archive_path = archive_storage_path()
         mkdir_p(archive_path)
-        shutil.move(config_file, os.path.join(archive_path, configuration))
+        shutil.move(config_file, archive_path / configuration)
 
         storage_json = StorageJSON.load(storage_path)
         if storage_json is not None and storage_json.build_path:
@@ -1086,7 +1081,7 @@ class UnArchiveRequestHandler(BaseHandler):
     def post(self, configuration: str | None = None) -> None:
         config_file = settings.rel_path(configuration)
         archive_path = archive_storage_path()
-        shutil.move(os.path.join(archive_path, configuration), config_file)
+        shutil.move(archive_path / configuration, config_file)
 
 
 class LoginHandler(BaseHandler):
@@ -1173,7 +1168,7 @@ class SecretKeysRequestHandler(BaseHandler):
 
         for secret_filename in const.SECRETS_FILES:
             relative_filename = settings.rel_path(secret_filename)
-            if os.path.isfile(relative_filename):
+            if relative_filename.is_file():
                 filename = relative_filename
                 break
 
@@ -1206,16 +1201,17 @@ class JsonConfigRequestHandler(BaseHandler):
     @bind_config
     async def get(self, configuration: str | None = None) -> None:
         filename = settings.rel_path(configuration)
-        if not os.path.isfile(filename):
+        if not filename.is_file():
             self.send_error(404)
             return
 
-        args = ["esphome", "config", filename, "--show-secrets"]
+        args = ["esphome", "config", str(filename), "--show-secrets"]
 
-        rc, stdout, _ = await async_run_system_command(args)
+        rc, stdout, stderr = await async_run_system_command(args)
 
         if rc != 0:
-            self.send_error(422)
+            self.set_status(422)
+            self.write(stderr)
             return
 
         data = yaml.load(stdout, Loader=SafeLoaderIgnoreUnknown)
@@ -1224,7 +1220,7 @@ class JsonConfigRequestHandler(BaseHandler):
         self.finish()
 
 
-def get_base_frontend_path() -> str:
+def get_base_frontend_path() -> Path:
     if ENV_DEV not in os.environ:
         import esphome_dashboard
 
@@ -1235,11 +1231,12 @@ def get_base_frontend_path() -> str:
         static_path += "/"
 
     # This path can be relative, so resolve against the root or else templates don't work
-    return os.path.abspath(os.path.join(os.getcwd(), static_path, "esphome_dashboard"))
+    path = Path(os.getcwd()) / static_path / "esphome_dashboard"
+    return path.resolve()
 
 
-def get_static_path(*args: Iterable[str]) -> str:
+def get_static_path(*args: Iterable[str]) -> Path:
-    return os.path.join(get_base_frontend_path(), "static", *args)
+    return get_base_frontend_path() / "static" / Path(*args)
 
 
 @functools.cache
@@ -1256,8 +1253,7 @@ def get_static_file_url(name: str) -> str:
         return base.replace("index.js", esphome_dashboard.entrypoint())
 
     path = get_static_path(name)
-    with open(path, "rb") as f_handle:
+    hash_ = hashlib.md5(path.read_bytes()).hexdigest()[:8]
-        hash_ = hashlib.md5(f_handle.read()).hexdigest()[:8]
     return f"{base}?hash={hash_}"
 
 
@@ -1357,7 +1353,7 @@ def start_web_server(
     """Start the web server listener."""
 
     trash_path = trash_storage_path()
-    if os.path.exists(trash_path):
+    if trash_path.is_dir() and trash_path.exists():
         _LOGGER.info("Renaming 'trash' folder to 'archive'")
         archive_path = archive_storage_path()
         shutil.move(trash_path, archive_path)

esphome/espota2.py

@@ -4,6 +4,7 @@ import gzip
 import hashlib
 import io
 import logging
+from pathlib import Path
 import random
 import socket
 import sys
@@ -191,7 +192,7 @@ def send_check(sock, data, msg):
 
 
 def perform_ota(
-    sock: socket.socket, password: str, file_handle: io.IOBase, filename: str
+    sock: socket.socket, password: str, file_handle: io.IOBase, filename: Path
 ) -> None:
     file_contents = file_handle.read()
     file_size = len(file_contents)
@@ -309,7 +310,7 @@ def perform_ota(
 
 
 def run_ota_impl_(
-    remote_host: str | list[str], remote_port: int, password: str, filename: str
+    remote_host: str | list[str], remote_port: int, password: str, filename: Path
 ) -> tuple[int, str | None]:
     from esphome.core import CORE
 
@@ -360,7 +361,7 @@ def run_ota_impl_(
 
 
 def run_ota(
-    remote_host: str | list[str], remote_port: int, password: str, filename: str
+    remote_host: str | list[str], remote_port: int, password: str, filename: Path
 ) -> tuple[int, str | None]:
     try:
         return run_ota_impl_(remote_host, remote_port, password, filename)

esphome/external_files.py

@@ -2,7 +2,6 @@ from __future__ import annotations
 
 from datetime import datetime
 import logging
-import os
 from pathlib import Path
 
 import requests
@@ -23,11 +22,11 @@ CONTENT_DISPOSITION = "content-disposition"
 TEMP_DIR = "temp"
 
 
-def has_remote_file_changed(url, local_file_path):
+def has_remote_file_changed(url: str, local_file_path: Path) -> bool:
-    if os.path.exists(local_file_path):
+    if local_file_path.exists():
         _LOGGER.debug("has_remote_file_changed: File exists at %s", local_file_path)
         try:
-            local_modification_time = os.path.getmtime(local_file_path)
+            local_modification_time = local_file_path.stat().st_mtime
             local_modification_time_str = datetime.utcfromtimestamp(
                 local_modification_time
             ).strftime("%a, %d %b %Y %H:%M:%S GMT")
@@ -65,9 +64,9 @@ def has_remote_file_changed(url, local_file_path):
     return True
 
 
-def is_file_recent(file_path: str, refresh: TimePeriodSeconds) -> bool:
+def is_file_recent(file_path: Path, refresh: TimePeriodSeconds) -> bool:
-    if os.path.exists(file_path):
+    if file_path.exists():
-        creation_time = os.path.getctime(file_path)
+        creation_time = file_path.stat().st_ctime
         current_time = datetime.now().timestamp()
         return current_time - creation_time <= refresh.total_seconds
     return False

esphome/helpers.py

@@ -1,6 +1,5 @@
 from __future__ import annotations
 
-import codecs
 from contextlib import suppress
 import ipaddress
 import logging
@@ -8,6 +7,7 @@ import os
 from pathlib import Path
 import platform
 import re
+import shutil
 import tempfile
 from typing import TYPE_CHECKING
 from urllib.parse import urlparse
@@ -140,16 +140,16 @@ def run_system_command(*args):
         return rc, stdout, stderr
 
 
-def mkdir_p(path):
+def mkdir_p(path: Path):
     if not path:
         # Empty path - means create current dir
         return
     try:
-        os.makedirs(path)
+        path.mkdir(parents=True, exist_ok=True)
     except OSError as err:
         import errno
 
-        if err.errno == errno.EEXIST and os.path.isdir(path):
+        if err.errno == errno.EEXIST and path.is_dir():
             pass
         else:
             from esphome.core import EsphomeError
@@ -331,16 +331,15 @@ def is_ha_addon():
     return get_bool_env("ESPHOME_IS_HA_ADDON")
 
 
-def walk_files(path):
+def walk_files(path: Path):
     for root, _, files in os.walk(path):
         for name in files:
-            yield os.path.join(root, name)
+            yield Path(root) / name
 
 
-def read_file(path):
+def read_file(path: Path) -> str:
     try:
-        with codecs.open(path, "r", encoding="utf-8") as f_handle:
+        return path.read_text(encoding="utf-8")
-            return f_handle.read()
     except OSError as err:
         from esphome.core import EsphomeError
 
@@ -351,13 +350,15 @@ def read_file(path):
         raise EsphomeError(f"Error reading file {path}: {err}") from err
 
 
-def _write_file(path: Path | str, text: str | bytes):
+def _write_file(
+    path: Path,
+    text: str | bytes,
+    private: bool = False,
+) -> None:
     """Atomically writes `text` to the given path.
 
     Automatically creates all parent directories.
     """
-    if not isinstance(path, Path):
-        path = Path(path)
     data = text
     if isinstance(text, str):
         data = text.encode()
@@ -365,42 +366,54 @@ def _write_file(path: Path | str, text: str | bytes):
     directory = path.parent
     directory.mkdir(exist_ok=True, parents=True)
 
-    tmp_path = None
+    tmp_filename: Path | None = None
+    missing_fchmod = False
     try:
+        # Modern versions of Python tempfile create this file with mode 0o600
         with tempfile.NamedTemporaryFile(
             mode="wb", dir=directory, delete=False
         ) as f_handle:
-            tmp_path = f_handle.name
             f_handle.write(data)
-        # Newer tempfile implementations create the file with mode 0o600
+            tmp_filename = Path(f_handle.name)
-        os.chmod(tmp_path, 0o644)
+
-        # If destination exists, will be overwritten
+            if not private:
-        os.replace(tmp_path, path)
+                try:
+                    os.fchmod(f_handle.fileno(), 0o644)
+                except AttributeError:
+                    # os.fchmod is not available on Windows
+                    missing_fchmod = True
+        shutil.move(tmp_filename, path)
+        if missing_fchmod:
+            path.chmod(0o644)
     finally:
-        if tmp_path is not None and os.path.exists(tmp_path):
+        if tmp_filename and tmp_filename.exists():
             try:
-                os.remove(tmp_path)
+                tmp_filename.unlink()
             except OSError as err:
-                _LOGGER.error("Write file cleanup failed: %s", err)
+                # If we are cleaning up then something else went wrong, so
+                # we should suppress likely follow-on errors in the cleanup
+                _LOGGER.error(
+                    "File replacement cleanup failed for %s while saving %s: %s",
+                    tmp_filename,
+                    path,
+                    err,
+                )
 
 
-def write_file(path: Path | str, text: str):
+def write_file(path: Path, text: str | bytes, private: bool = False) -> None:
     try:
-        _write_file(path, text)
+        _write_file(path, text, private=private)
     except OSError as err:
         from esphome.core import EsphomeError
 
         raise EsphomeError(f"Could not write file at {path}") from err
 
 
-def write_file_if_changed(path: Path | str, text: str) -> bool:
+def write_file_if_changed(path: Path, text: str) -> bool:
     """Write text to the given path, but not if the contents match already.
 
     Returns true if the file was changed.
     """
-    if not isinstance(path, Path):
-        path = Path(path)
-
     src_content = None
     if path.is_file():
         src_content = read_file(path)
@@ -410,12 +423,10 @@ def write_file_if_changed(path: Path | str, text: str) -> bool:
     return True
 
 
-def copy_file_if_changed(src: os.PathLike, dst: os.PathLike) -> None:
+def copy_file_if_changed(src: Path, dst: Path) -> None:
-    import shutil
-
     if file_compare(src, dst):
         return
-    mkdir_p(os.path.dirname(dst))
+    dst.parent.mkdir(parents=True, exist_ok=True)
     try:
         shutil.copyfile(src, dst)
     except OSError as err:
@@ -440,12 +451,12 @@ def list_starts_with(list_, sub):
     return len(sub) <= len(list_) and all(list_[i] == x for i, x in enumerate(sub))
 
 
-def file_compare(path1: os.PathLike, path2: os.PathLike) -> bool:
+def file_compare(path1: Path, path2: Path) -> bool:
     """Return True if the files path1 and path2 have the same contents."""
     import stat
 
     try:
-        stat1, stat2 = os.stat(path1), os.stat(path2)
+        stat1, stat2 = path1.stat(), path2.stat()
     except OSError:
         # File doesn't exist or another error -> not equal
         return False
@@ -462,7 +473,7 @@ def file_compare(path1: os.PathLike, path2: os.PathLike) -> bool:
 
     bufsize = 8 * 1024
     # Read files in blocks until a mismatch is found
-    with open(path1, "rb") as fh1, open(path2, "rb") as fh2:
+    with path1.open("rb") as fh1, path2.open("rb") as fh2:
         while True:
             blob1, blob2 = fh1.read(bufsize), fh2.read(bufsize)
             if blob1 != blob2:

esphome/platformio_api.py

@@ -18,23 +18,25 @@ def patch_structhash():
     # removed/added. This might have unintended consequences, but this improves compile
     # times greatly when adding/removing components and a simple clean build solves
     # all issues
-    from os import makedirs
-    from os.path import getmtime, isdir, join
-
     from platformio.run import cli, helpers
 
     def patched_clean_build_dir(build_dir, *args):
         from platformio import fs
         from platformio.project.helpers import get_project_dir
 
-        platformio_ini = join(get_project_dir(), "platformio.ini")
+        platformio_ini = Path(get_project_dir()) / "platformio.ini"
+
+        build_dir = Path(build_dir)
 
         # if project's config is modified
-        if isdir(build_dir) and getmtime(platformio_ini) > getmtime(build_dir):
+        if (
+            build_dir.is_dir()
+            and platformio_ini.stat().st_mtime > build_dir.stat().st_mtime
+        ):
             fs.rmtree(build_dir)
 
-        if not isdir(build_dir):
+        if not build_dir.is_dir():
-            makedirs(build_dir)
+            build_dir.mkdir(parents=True)
 
     helpers.clean_build_dir = patched_clean_build_dir
     cli.clean_build_dir = patched_clean_build_dir
@@ -77,9 +79,9 @@ FILTER_PLATFORMIO_LINES = [
 
 def run_platformio_cli(*args, **kwargs) -> str | int:
     os.environ["PLATFORMIO_FORCE_COLOR"] = "true"
-    os.environ["PLATFORMIO_BUILD_DIR"] = os.path.abspath(CORE.relative_pioenvs_path())
+    os.environ["PLATFORMIO_BUILD_DIR"] = str(CORE.relative_pioenvs_path().absolute())
     os.environ.setdefault(
-        "PLATFORMIO_LIBDEPS_DIR", os.path.abspath(CORE.relative_piolibdeps_path())
+        "PLATFORMIO_LIBDEPS_DIR", str(CORE.relative_piolibdeps_path().absolute())
     )
     # Suppress Python syntax warnings from third-party scripts during compilation
     os.environ.setdefault("PYTHONWARNINGS", "ignore::SyntaxWarning")
@@ -98,7 +100,7 @@ def run_platformio_cli(*args, **kwargs) -> str | int:
 
 
 def run_platformio_cli_run(config, verbose, *args, **kwargs) -> str | int:
-    command = ["run", "-d", CORE.build_path]
+    command = ["run", "-d", str(CORE.build_path)]
     if verbose:
         command += ["-v"]
     command += list(args)
@@ -130,8 +132,8 @@ def _run_idedata(config):
 
 
 def _load_idedata(config):
-    platformio_ini = Path(CORE.relative_build_path("platformio.ini"))
+    platformio_ini = CORE.relative_build_path("platformio.ini")
-    temp_idedata = Path(CORE.relative_internal_path("idedata", f"{CORE.name}.json"))
+    temp_idedata = CORE.relative_internal_path("idedata", f"{CORE.name}.json")
 
     changed = False
     if (
@@ -301,7 +303,7 @@ def process_stacktrace(config, line, backtrace_state):
 
 @dataclass
 class FlashImage:
-    path: str
+    path: Path
     offset: str
 
 
@@ -310,17 +312,17 @@ class IDEData:
         self.raw = raw
 
     @property
-    def firmware_elf_path(self):
+    def firmware_elf_path(self) -> Path:
-        return self.raw["prog_path"]
+        return Path(self.raw["prog_path"])
 
     @property
-    def firmware_bin_path(self) -> str:
+    def firmware_bin_path(self) -> Path:
-        return str(Path(self.firmware_elf_path).with_suffix(".bin"))
+        return self.firmware_elf_path.with_suffix(".bin")
 
     @property
     def extra_flash_images(self) -> list[FlashImage]:
         return [
-            FlashImage(path=entry["path"], offset=entry["offset"])
+            FlashImage(path=Path(entry["path"]), offset=entry["offset"])
             for entry in self.raw["extra"]["flash_images"]
         ]
 

esphome/storage_json.py

@@ -1,11 +1,11 @@
 from __future__ import annotations
 
 import binascii
-import codecs
 from datetime import datetime
 import json
 import logging
 import os
+from pathlib import Path
 
 from esphome import const
 from esphome.const import CONF_DISABLED, CONF_MDNS
@@ -16,30 +16,35 @@ from esphome.types import CoreType
 _LOGGER = logging.getLogger(__name__)
 
 
-def storage_path() -> str:
+def storage_path() -> Path:
-    return os.path.join(CORE.data_dir, "storage", f"{CORE.config_filename}.json")
+    return CORE.data_dir / "storage" / f"{CORE.config_filename}.json"
 
 
-def ext_storage_path(config_filename: str) -> str:
+def ext_storage_path(config_filename: str) -> Path:
-    return os.path.join(CORE.data_dir, "storage", f"{config_filename}.json")
+    return CORE.data_dir / "storage" / f"{config_filename}.json"
 
 
-def esphome_storage_path() -> str:
+def esphome_storage_path() -> Path:
-    return os.path.join(CORE.data_dir, "esphome.json")
+    return CORE.data_dir / "esphome.json"
 
 
-def ignored_devices_storage_path() -> str:
+def ignored_devices_storage_path() -> Path:
-    return os.path.join(CORE.data_dir, "ignored-devices.json")
+    return CORE.data_dir / "ignored-devices.json"
 
 
-def trash_storage_path() -> str:
+def trash_storage_path() -> Path:
     return CORE.relative_config_path("trash")
 
 
-def archive_storage_path() -> str:
+def archive_storage_path() -> Path:
     return CORE.relative_config_path("archive")
 
 
+def _to_path_if_not_none(value: str | None) -> Path | None:
+    """Convert a string to Path if it's not None."""
+    return Path(value) if value is not None else None
+
+
 class StorageJSON:
     def __init__(
         self,
@@ -52,8 +57,8 @@ class StorageJSON:
         address: str,
         web_port: int | None,
         target_platform: str,
-        build_path: str | None,
+        build_path: Path | None,
-        firmware_bin_path: str | None,
+        firmware_bin_path: Path | None,
         loaded_integrations: set[str],
         loaded_platforms: set[str],
         no_mdns: bool,
@@ -107,8 +112,8 @@ class StorageJSON:
             "address": self.address,
             "web_port": self.web_port,
             "esp_platform": self.target_platform,
-            "build_path": self.build_path,
+            "build_path": str(self.build_path),
-            "firmware_bin_path": self.firmware_bin_path,
+            "firmware_bin_path": str(self.firmware_bin_path),
             "loaded_integrations": sorted(self.loaded_integrations),
             "loaded_platforms": sorted(self.loaded_platforms),
             "no_mdns": self.no_mdns,
@@ -176,8 +181,8 @@ class StorageJSON:
         )
 
     @staticmethod
-    def _load_impl(path: str) -> StorageJSON | None:
+    def _load_impl(path: Path) -> StorageJSON | None:
-        with codecs.open(path, "r", encoding="utf-8") as f_handle:
+        with path.open("r", encoding="utf-8") as f_handle:
             storage = json.load(f_handle)
         storage_version = storage["storage_version"]
         name = storage.get("name")
@@ -190,8 +195,8 @@ class StorageJSON:
         address = storage.get("address")
         web_port = storage.get("web_port")
         esp_platform = storage.get("esp_platform")
-        build_path = storage.get("build_path")
+        build_path = _to_path_if_not_none(storage.get("build_path"))
-        firmware_bin_path = storage.get("firmware_bin_path")
+        firmware_bin_path = _to_path_if_not_none(storage.get("firmware_bin_path"))
         loaded_integrations = set(storage.get("loaded_integrations", []))
         loaded_platforms = set(storage.get("loaded_platforms", []))
         no_mdns = storage.get("no_mdns", False)
@@ -217,7 +222,7 @@ class StorageJSON:
         )
 
     @staticmethod
-    def load(path: str) -> StorageJSON | None:
+    def load(path: Path) -> StorageJSON | None:
         try:
             return StorageJSON._load_impl(path)
         except Exception:  # pylint: disable=broad-except
@@ -268,7 +273,7 @@ class EsphomeStorageJSON:
 
     @staticmethod
     def _load_impl(path: str) -> EsphomeStorageJSON | None:
-        with codecs.open(path, "r", encoding="utf-8") as f_handle:
+        with Path(path).open("r", encoding="utf-8") as f_handle:
             storage = json.load(f_handle)
         storage_version = storage["storage_version"]
         cookie_secret = storage.get("cookie_secret")

esphome/util.py

@@ -1,7 +1,6 @@
 import collections
 import io
 import logging
-import os
 from pathlib import Path
 import re
 import subprocess
@@ -86,7 +85,10 @@ def safe_input(prompt=""):
     return input()
 
 
-def shlex_quote(s):
+def shlex_quote(s: str | Path) -> str:
+    # Convert Path objects to strings
+    if isinstance(s, Path):
+        s = str(s)
     if not s:
         return "''"
     if re.search(r"[^\w@%+=:,./-]", s) is None:
@@ -272,25 +274,28 @@ class OrderedDict(collections.OrderedDict):
         return dict(self).__repr__()
 
 
-def list_yaml_files(configs: list[str]) -> list[str]:
+def list_yaml_files(configs: list[str | Path]) -> list[Path]:
-    files: list[str] = []
+    files: list[Path] = []
     for config in configs:
-        if os.path.isfile(config):
+        config = Path(config)
+        if not config.exists():
+            raise FileNotFoundError(f"Config path '{config}' does not exist!")
+        if config.is_file():
             files.append(config)
         else:
-            files.extend(os.path.join(config, p) for p in os.listdir(config))
+            files.extend(config.glob("*"))
     files = filter_yaml_files(files)
     return sorted(files)
 
 
-def filter_yaml_files(files: list[str]) -> list[str]:
+def filter_yaml_files(files: list[Path]) -> list[Path]:
     return [
         f
         for f in files
         if (
-            os.path.splitext(f)[1] in (".yaml", ".yml")
+            f.suffix in (".yaml", ".yml")
-            and os.path.basename(f) not in ("secrets.yaml", "secrets.yml")
+            and f.name not in ("secrets.yaml", "secrets.yml")
-            and not os.path.basename(f).startswith(".")
+            and not f.name.startswith(".")
         )
     ]
 

esphome/vscode.py

@@ -2,7 +2,7 @@ from __future__ import annotations
 
 from io import StringIO
 import json
-import os
+from pathlib import Path
 from typing import Any
 
 from esphome.config import Config, _format_vol_invalid, validate_config
@@ -67,24 +67,24 @@ def _read_file_content_from_json_on_stdin() -> str:
     return data["content"]
 
 
-def _print_file_read_event(path: str) -> None:
+def _print_file_read_event(path: Path) -> None:
     """Print a file read event."""
     print(
         json.dumps(
             {
                 "type": "read_file",
-                "path": path,
+                "path": str(path),
             }
         )
     )
 
 
-def _request_and_get_stream_on_stdin(fname: str) -> StringIO:
+def _request_and_get_stream_on_stdin(fname: Path) -> StringIO:
     _print_file_read_event(fname)
     return StringIO(_read_file_content_from_json_on_stdin())
 
 
-def _vscode_loader(fname: str) -> dict[str, Any]:
+def _vscode_loader(fname: Path) -> dict[str, Any]:
     raw_yaml_stream = _request_and_get_stream_on_stdin(fname)
     # it is required to set the name on StringIO so document on start_mark
     # is set properly. Otherwise it is initialized with "<file>"
@@ -92,7 +92,7 @@ def _vscode_loader(fname: str) -> dict[str, Any]:
     return parse_yaml(fname, raw_yaml_stream, _vscode_loader)
 
 
-def _ace_loader(fname: str) -> dict[str, Any]:
+def _ace_loader(fname: Path) -> dict[str, Any]:
     raw_yaml_stream = _request_and_get_stream_on_stdin(fname)
     return parse_yaml(fname, raw_yaml_stream)
 
@@ -120,10 +120,10 @@ def read_config(args):
             return
         CORE.vscode = True
         if args.ace:  # Running from ESPHome Compiler dashboard, not vscode
-            CORE.config_path = os.path.join(args.configuration, data["file"])
+            CORE.config_path = Path(args.configuration) / data["file"]
             loader = _ace_loader
         else:
-            CORE.config_path = data["file"]
+            CORE.config_path = Path(data["file"])
             loader = _vscode_loader
 
         file_name = CORE.config_path

esphome/wizard.py

@@ -1,4 +1,4 @@
-import os
+from pathlib import Path
 import random
 import string
 from typing import Literal, NotRequired, TypedDict, Unpack
@@ -213,7 +213,7 @@ class WizardWriteKwargs(TypedDict):
     file_text: NotRequired[str]
 
 
-def wizard_write(path: str, **kwargs: Unpack[WizardWriteKwargs]) -> bool:
+def wizard_write(path: Path, **kwargs: Unpack[WizardWriteKwargs]) -> bool:
     from esphome.components.bk72xx import boards as bk72xx_boards
     from esphome.components.esp32 import boards as esp32_boards
     from esphome.components.esp8266 import boards as esp8266_boards
@@ -256,13 +256,13 @@ def wizard_write(path: str, **kwargs: Unpack[WizardWriteKwargs]) -> bool:
         file_text = wizard_file(**kwargs)
 
     # Check if file already exists to prevent overwriting
-    if os.path.exists(path) and os.path.isfile(path):
+    if path.exists() and path.is_file():
         safe_print(color(AnsiFore.RED, f'The file "{path}" already exists.'))
         return False
 
     write_file(path, file_text)
     storage = StorageJSON.from_wizard(name, name, f"{name}.local", hardware)
-    storage_path = ext_storage_path(os.path.basename(path))
+    storage_path = ext_storage_path(path.name)
     storage.save(storage_path)
 
     return True
@@ -301,7 +301,7 @@ def strip_accents(value: str) -> str:
     )
 
 
-def wizard(path: str) -> int:
+def wizard(path: Path) -> int:
     from esphome.components.bk72xx import boards as bk72xx_boards
     from esphome.components.esp32 import boards as esp32_boards
     from esphome.components.esp8266 import boards as esp8266_boards
@@ -309,14 +309,14 @@ def wizard(path: str) -> int:
     from esphome.components.rp2040 import boards as rp2040_boards
     from esphome.components.rtl87xx import boards as rtl87xx_boards
 
-    if not path.endswith(".yaml") and not path.endswith(".yml"):
+    if path.suffix not in (".yaml", ".yml"):
         safe_print(
-            f"Please make your configuration file {color(AnsiFore.CYAN, path)} have the extension .yaml or .yml"
+            f"Please make your configuration file {color(AnsiFore.CYAN, str(path))} have the extension .yaml or .yml"
         )
         return 1
-    if os.path.exists(path):
+    if path.exists():
         safe_print(
-            f"Uh oh, it seems like {color(AnsiFore.CYAN, path)} already exists, please delete that file first or chose another configuration file."
+            f"Uh oh, it seems like {color(AnsiFore.CYAN, str(path))} already exists, please delete that file first or chose another configuration file."
         )
         return 2
 
@@ -549,7 +549,7 @@ def wizard(path: str) -> int:
     safe_print()
     safe_print(
         color(AnsiFore.CYAN, "DONE! I've now written a new configuration file to ")
-        + color(AnsiFore.BOLD_CYAN, path)
+        + color(AnsiFore.BOLD_CYAN, str(path))
     )
     safe_print()
     safe_print("Next steps:")

esphome/writer.py

@@ -1,6 +1,5 @@
 import importlib
 import logging
-import os
 from pathlib import Path
 import re
 
@@ -266,7 +265,7 @@ def generate_version_h():
 
 def write_cpp(code_s):
     path = CORE.relative_src_path("main.cpp")
-    if os.path.isfile(path):
+    if path.is_file():
         text = read_file(path)
         code_format = find_begin_end(
             text, CPP_AUTO_GENERATE_BEGIN, CPP_AUTO_GENERATE_END
@@ -292,28 +291,28 @@ def write_cpp(code_s):
 
 def clean_cmake_cache():
     pioenvs = CORE.relative_pioenvs_path()
-    if os.path.isdir(pioenvs):
+    if pioenvs.is_dir():
-        pioenvs_cmake_path = CORE.relative_pioenvs_path(CORE.name, "CMakeCache.txt")
+        pioenvs_cmake_path = pioenvs / CORE.name / "CMakeCache.txt"
-        if os.path.isfile(pioenvs_cmake_path):
+        if pioenvs_cmake_path.is_file():
             _LOGGER.info("Deleting %s", pioenvs_cmake_path)
-            os.remove(pioenvs_cmake_path)
+            pioenvs_cmake_path.unlink()
 
 
 def clean_build():
     import shutil
 
     pioenvs = CORE.relative_pioenvs_path()
-    if os.path.isdir(pioenvs):
+    if pioenvs.is_dir():
         _LOGGER.info("Deleting %s", pioenvs)
         shutil.rmtree(pioenvs)
     piolibdeps = CORE.relative_piolibdeps_path()
-    if os.path.isdir(piolibdeps):
+    if piolibdeps.is_dir():
         _LOGGER.info("Deleting %s", piolibdeps)
         shutil.rmtree(piolibdeps)
     dependencies_lock = CORE.relative_build_path("dependencies.lock")
-    if os.path.isfile(dependencies_lock):
+    if dependencies_lock.is_file():
         _LOGGER.info("Deleting %s", dependencies_lock)
-        os.remove(dependencies_lock)
+        dependencies_lock.unlink()
 
     # Clean PlatformIO cache to resolve CMake compiler detection issues
     # This helps when toolchain paths change or get corrupted
@@ -324,7 +323,9 @@ def clean_build():
         pass
     else:
         cache_dir = get_project_cache_dir()
-        if cache_dir and cache_dir.strip() and os.path.isdir(cache_dir):
+        if cache_dir and cache_dir.strip():
+            cache_path = Path(cache_dir)
+            if cache_path.is_dir():
                 _LOGGER.info("Deleting PlatformIO cache %s", cache_dir)
                 shutil.rmtree(cache_dir)
 
@@ -339,6 +340,5 @@ GITIGNORE_CONTENT = """# Gitignore settings for ESPHome
 
 def write_gitignore():
     path = CORE.relative_config_path(".gitignore")
-    if not os.path.isfile(path):
+    if not path.is_file():
-        with open(file=path, mode="w", encoding="utf-8") as f:
+        path.write_text(GITIGNORE_CONTENT, encoding="utf-8")
-            f.write(GITIGNORE_CONTENT)

esphome/yaml_util.py

@@ -1,7 +1,6 @@
 from __future__ import annotations
 
 from collections.abc import Callable
-import fnmatch
 import functools
 import inspect
 from io import BytesIO, TextIOBase, TextIOWrapper
@@ -9,6 +8,7 @@ from ipaddress import _BaseAddress, _BaseNetwork
 import logging
 import math
 import os
+from pathlib import Path
 from typing import Any
 import uuid
 
@@ -109,7 +109,9 @@ def _add_data_ref(fn):
 class ESPHomeLoaderMixin:
     """Loader class that keeps track of line numbers."""
 
-    def __init__(self, name: str, yaml_loader: Callable[[str], dict[str, Any]]) -> None:
+    def __init__(
+        self, name: Path, yaml_loader: Callable[[Path], dict[str, Any]]
+    ) -> None:
         """Initialize the loader."""
         self.name = name
         self.yaml_loader = yaml_loader
@@ -254,12 +256,8 @@ class ESPHomeLoaderMixin:
             f"Environment variable '{node.value}' not defined", node.start_mark
         )
 
-    @property
+    def _rel_path(self, *args: str) -> Path:
-    def _directory(self) -> str:
+        return self.name.parent / Path(*args)
-        return os.path.dirname(self.name)
-
-    def _rel_path(self, *args: str) -> str:
-        return os.path.join(self._directory, *args)
 
     @_add_data_ref
     def construct_secret(self, node: yaml.Node) -> str:
@@ -269,8 +267,8 @@ class ESPHomeLoaderMixin:
             if self.name == CORE.config_path:
                 raise e
             try:
-                main_config_dir = os.path.dirname(CORE.config_path)
+                main_config_dir = CORE.config_path.parent
-                main_secret_yml = os.path.join(main_config_dir, SECRET_YAML)
+                main_secret_yml = main_config_dir / SECRET_YAML
                 secrets = self.yaml_loader(main_secret_yml)
             except EsphomeError as er:
                 raise EsphomeError(f"{e}\n{er}") from er
@@ -329,7 +327,7 @@ class ESPHomeLoaderMixin:
         files = filter_yaml_files(_find_files(self._rel_path(node.value), "*.yaml"))
         mapping = OrderedDict()
         for fname in files:
-            filename = os.path.splitext(os.path.basename(fname))[0]
+            filename = fname.stem
             mapping[filename] = self.yaml_loader(fname)
         return mapping
 
@@ -369,8 +367,8 @@ class ESPHomeLoader(ESPHomeLoaderMixin, FastestAvailableSafeLoader):
     def __init__(
         self,
         stream: TextIOBase | BytesIO,
-        name: str,
+        name: Path,
-        yaml_loader: Callable[[str], dict[str, Any]],
+        yaml_loader: Callable[[Path], dict[str, Any]],
     ) -> None:
         FastestAvailableSafeLoader.__init__(self, stream)
         ESPHomeLoaderMixin.__init__(self, name, yaml_loader)
@@ -382,8 +380,8 @@ class ESPHomePurePythonLoader(ESPHomeLoaderMixin, PurePythonLoader):
     def __init__(
         self,
         stream: TextIOBase | BytesIO,
-        name: str,
+        name: Path,
-        yaml_loader: Callable[[str], dict[str, Any]],
+        yaml_loader: Callable[[Path], dict[str, Any]],
     ) -> None:
         PurePythonLoader.__init__(self, stream)
         ESPHomeLoaderMixin.__init__(self, name, yaml_loader)
@@ -414,24 +412,24 @@ for _loader in (ESPHomeLoader, ESPHomePurePythonLoader):
     _loader.add_constructor("!remove", _loader.construct_remove)
 
 
-def load_yaml(fname: str, clear_secrets: bool = True) -> Any:
+def load_yaml(fname: Path, clear_secrets: bool = True) -> Any:
     if clear_secrets:
         _SECRET_VALUES.clear()
         _SECRET_CACHE.clear()
     return _load_yaml_internal(fname)
 
 
-def _load_yaml_internal(fname: str) -> Any:
+def _load_yaml_internal(fname: Path) -> Any:
     """Load a YAML file."""
     try:
-        with open(fname, encoding="utf-8") as f_handle:
+        with fname.open(encoding="utf-8") as f_handle:
             return parse_yaml(fname, f_handle)
     except (UnicodeDecodeError, OSError) as err:
         raise EsphomeError(f"Error reading file {fname}: {err}") from err
 
 
 def parse_yaml(
-    file_name: str, file_handle: TextIOWrapper, yaml_loader=_load_yaml_internal
+    file_name: Path, file_handle: TextIOWrapper, yaml_loader=_load_yaml_internal
 ) -> Any:
     """Parse a YAML file."""
     try:
@@ -483,9 +481,9 @@ def substitute_vars(config, vars):
 
 def _load_yaml_internal_with_type(
     loader_type: type[ESPHomeLoader] | type[ESPHomePurePythonLoader],
-    fname: str,
+    fname: Path,
     content: TextIOWrapper,
-    yaml_loader: Any,
+    yaml_loader: Callable[[Path], dict[str, Any]],
 ) -> Any:
     """Load a YAML file."""
     loader = loader_type(content, fname, yaml_loader)
@@ -512,13 +510,14 @@ def _is_file_valid(name: str) -> bool:
     return not name.startswith(".")
 
 
-def _find_files(directory, pattern):
+def _find_files(directory: Path, pattern):
     """Recursively load files in a directory."""
-    for root, dirs, files in os.walk(directory, topdown=True):
+    for root, dirs, files in os.walk(directory):
         dirs[:] = [d for d in dirs if _is_file_valid(d)]
-        for basename in files:
+        for f in files:
-            if _is_file_valid(basename) and fnmatch.fnmatch(basename, pattern):
+            filename = Path(f)
-                filename = os.path.join(root, basename)
+            if _is_file_valid(f) and filename.match(pattern):
+                filename = Path(root) / filename
                 yield filename
 
 
@@ -627,3 +626,4 @@ ESPHomeDumper.add_multi_representer(TimePeriod, ESPHomeDumper.represent_stringif
 ESPHomeDumper.add_multi_representer(Lambda, ESPHomeDumper.represent_lambda)
 ESPHomeDumper.add_multi_representer(core.ID, ESPHomeDumper.represent_id)
 ESPHomeDumper.add_multi_representer(uuid.UUID, ESPHomeDumper.represent_stringify)
+ESPHomeDumper.add_multi_representer(Path, ESPHomeDumper.represent_stringify)

script/api_protobuf/api_protobuf.py

@@ -3,7 +3,6 @@ from __future__ import annotations
 
 from abc import ABC, abstractmethod
 from enum import IntEnum
-import os
 from pathlib import Path
 import re
 from subprocess import call
@@ -2704,8 +2703,8 @@ static const char *const TAG = "api.service";
         import clang_format
 
         def exec_clang_format(path: Path) -> None:
-            clang_format_path = os.path.join(
+            clang_format_path = (
-                os.path.dirname(clang_format.__file__), "data", "bin", "clang-format"
+                Path(clang_format.__file__).parent / "data" / "bin" / "clang-format"
             )
             call([clang_format_path, "-i", path])
 

script/build_codeowners.py

@@ -39,7 +39,7 @@ esphome/core/* @esphome/core
 parts = [BASE]
 
 # Fake some directory so that get_component works
-CORE.config_path = str(root)
+CORE.config_path = root
 CORE.data[KEY_CORE] = {KEY_TARGET_FRAMEWORK: None, KEY_TARGET_PLATFORM: None}
 
 codeowners = defaultdict(list)

script/build_language_schema.py

@@ -1,9 +1,9 @@
 #!/usr/bin/env python3
 import argparse
-import glob
 import inspect
 import json
 import os
+from pathlib import Path
 import re
 
 import voluptuous as vol
@@ -70,14 +70,14 @@ def get_component_names():
     component_names = ["esphome", "sensor", "esp32", "esp8266"]
     skip_components = []
 
-    for d in os.listdir(CORE_COMPONENTS_PATH):
+    for d in CORE_COMPONENTS_PATH.iterdir():
         if (
-            not d.startswith("__")
+            not d.name.startswith("__")
-            and os.path.isdir(os.path.join(CORE_COMPONENTS_PATH, d))
+            and d.is_dir()
-            and d not in component_names
+            and d.name not in component_names
-            and d not in skip_components
+            and d.name not in skip_components
         ):
-            component_names.append(d)
+            component_names.append(d.name)
 
     return sorted(component_names)
 
@@ -121,7 +121,7 @@ from esphome.util import Registry  # noqa: E402
 
 
 def write_file(name, obj):
-    full_path = os.path.join(args.output_path, name + ".json")
+    full_path = Path(args.output_path) / f"{name}.json"
     if JSON_DUMP_PRETTY:
         json_str = json.dumps(obj, indent=2)
     else:
@@ -131,9 +131,10 @@ def write_file(name, obj):
 
 
 def delete_extra_files(keep_names):
-    for d in os.listdir(args.output_path):
+    output_path = Path(args.output_path)
-        if d.endswith(".json") and d[:-5] not in keep_names:
+    for d in output_path.iterdir():
-            os.remove(os.path.join(args.output_path, d))
+        if d.suffix == ".json" and d.stem not in keep_names:
+            d.unlink()
             print(f"Deleted {d}")
 
 
@@ -367,10 +368,8 @@ def get_logger_tags():
         "scheduler",
         "api.service",
     ]
-    for x in os.walk(CORE_COMPONENTS_PATH):
+    for file in CORE_COMPONENTS_PATH.rglob("*.cpp"):
-        for y in glob.glob(os.path.join(x[0], "*.cpp")):
+        data = file.read_text()
-            with open(y, encoding="utf-8") as file:
-                data = file.read()
         match = pattern.search(data)
         if match:
             tags.append(match.group(1))

script/ci-custom.py

@@ -6,6 +6,7 @@ import collections
 import fnmatch
 import functools
 import os.path
+from pathlib import Path
 import re
 import sys
 import time
@@ -75,12 +76,12 @@ ignore_types = (
 LINT_FILE_CHECKS = []
 LINT_CONTENT_CHECKS = []
 LINT_POST_CHECKS = []
-EXECUTABLE_BIT = {}
+EXECUTABLE_BIT: dict[str, int] = {}
 
-errors = collections.defaultdict(list)
+errors: collections.defaultdict[Path, list] = collections.defaultdict(list)
 
 
-def add_errors(fname, errs):
+def add_errors(fname: Path, errs: list[tuple[int, int, str] | None]) -> None:
     if not isinstance(errs, list):
         errs = [errs]
     for err in errs:
@@ -246,8 +247,8 @@ def lint_ext_check(fname):
         ".github/copilot-instructions.md",
     ]
 )
-def lint_executable_bit(fname):
+def lint_executable_bit(fname: Path) -> str | None:
-    ex = EXECUTABLE_BIT[fname]
+    ex = EXECUTABLE_BIT[str(fname)]
     if ex != 100644:
         return (
             f"File has invalid executable bit {ex}. If running from a windows machine please "
@@ -506,8 +507,8 @@ def lint_constants_usage():
     return errs
 
 
-def relative_cpp_search_text(fname, content):
+def relative_cpp_search_text(fname: Path, content) -> str:
-    parts = fname.split("/")
+    parts = fname.parts
     integration = parts[2]
     return f'#include "esphome/components/{integration}'
 
@@ -524,8 +525,8 @@ def lint_relative_cpp_import(fname, line, col, content):
     )
 
 
-def relative_py_search_text(fname, content):
+def relative_py_search_text(fname: Path, content: str) -> str:
-    parts = fname.split("/")
+    parts = fname.parts
     integration = parts[2]
     return f"esphome.components.{integration}"
 
@@ -591,10 +592,8 @@ def lint_relative_py_import(fname, line, col, content):
         "esphome/components/http_request/httplib.h",
     ],
 )
-def lint_namespace(fname, content):
+def lint_namespace(fname: Path, content: str) -> str | None:
-    expected_name = re.match(
+    expected_name = fname.parts[2]
-        r"^esphome/components/([^/]+)/.*", fname.replace(os.path.sep, "/")
-    ).group(1)
     # Check for both old style and C++17 nested namespace syntax
     search_old = f"namespace {expected_name}"
     search_new = f"namespace esphome::{expected_name}"
@@ -733,9 +732,9 @@ def main():
     files.sort()
 
     for fname in files:
-        _, ext = os.path.splitext(fname)
+        fname = Path(fname)
         run_checks(LINT_FILE_CHECKS, fname, fname)
-        if ext in ignore_types:
+        if fname.suffix in ignore_types:
             continue
         try:
             with codecs.open(fname, "r", encoding="utf-8") as f_handle:

script/helpers.py

@@ -52,10 +52,10 @@ def styled(color: str | tuple[str, ...], msg: str, reset: bool = True) -> str:
     return prefix + msg + suffix
 
 
-def print_error_for_file(file: str, body: str | None) -> None:
+def print_error_for_file(file: str | Path, body: str | None) -> None:
     print(
         styled(colorama.Fore.GREEN, "### File ")
-        + styled((colorama.Fore.GREEN, colorama.Style.BRIGHT), file)
+        + styled((colorama.Fore.GREEN, colorama.Style.BRIGHT), str(file))
     )
     print()
     if body is not None:
@@ -513,7 +513,7 @@ def get_all_dependencies(component_names: set[str]) -> set[str]:
 
     # Set up fake config path for component loading
     root = Path(__file__).parent.parent
-    CORE.config_path = str(root)
+    CORE.config_path = root
     CORE.data[KEY_CORE] = {}
 
     # Keep finding dependencies until no new ones are found
@@ -553,7 +553,7 @@ def get_components_from_integration_fixtures() -> set[str]:
     fixtures_dir = Path(__file__).parent.parent / "tests" / "integration" / "fixtures"
 
     for yaml_file in fixtures_dir.glob("*.yaml"):
-        config: dict[str, any] | None = yaml_util.load_yaml(str(yaml_file))
+        config: dict[str, any] | None = yaml_util.load_yaml(yaml_file)
         if not config:
             continue
 

script/list-components.py

@@ -50,7 +50,7 @@ def create_components_graph():
     root = Path(__file__).parent.parent
     components_dir = root / "esphome" / "components"
     # Fake some directory so that get_component works
-    CORE.config_path = str(root)
+    CORE.config_path = root
     # Various configuration to capture different outcomes used by `AUTO_LOAD` function.
     TARGET_CONFIGURATIONS = [
         {KEY_TARGET_FRAMEWORK: None, KEY_TARGET_PLATFORM: None},

tests/component_tests/conftest.py

@@ -40,9 +40,9 @@ def config_path(request: pytest.FixtureRequest) -> Generator[None]:
     if config_dir.exists():
         # Set config_path to a dummy yaml file in the config directory
         # This ensures CORE.config_dir points to the config directory
-        CORE.config_path = str(config_dir / "dummy.yaml")
+        CORE.config_path = config_dir / "dummy.yaml"
     else:
-        CORE.config_path = str(Path(request.fspath).parent / "dummy.yaml")
+        CORE.config_path = Path(request.fspath).parent / "dummy.yaml"
 
     yield
     CORE.config_path = original_path
@@ -129,7 +129,7 @@ def generate_main() -> Generator[Callable[[str | Path], str]]:
     """Generates the C++ main.cpp from a given yaml file and returns it in string form."""
 
     def generator(path: str | Path) -> str:
-        CORE.config_path = str(path)
+        CORE.config_path = Path(path)
         CORE.config = read_config({})
         generate_cpp_contents(CORE.config)
         return CORE.cpp_main_section

tests/dashboard/test_entries.py

@@ -22,7 +22,7 @@ def create_cache_key() -> tuple[int, int, float, int]:
 def setup_core():
     """Set up CORE for testing."""
     with tempfile.TemporaryDirectory() as tmpdir:
-        CORE.config_path = str(Path(tmpdir) / "test.yaml")
+        CORE.config_path = Path(tmpdir) / "test.yaml"
         yield
         CORE.reset()
 
@@ -44,7 +44,7 @@ async def dashboard_entries(mock_settings: MagicMock) -> DashboardEntries:
 
 def test_dashboard_entry_path_initialization() -> None:
     """Test DashboardEntry initializes with path correctly."""
-    test_path = "/test/config/device.yaml"
+    test_path = Path("/test/config/device.yaml")
     cache_key = create_cache_key()
 
     entry = DashboardEntry(test_path, cache_key)
@@ -59,21 +59,21 @@ def test_dashboard_entry_path_with_absolute_path() -> None:
     test_path = Path.cwd() / "absolute" / "path" / "to" / "config.yaml"
     cache_key = create_cache_key()
 
-    entry = DashboardEntry(str(test_path), cache_key)
+    entry = DashboardEntry(test_path, cache_key)
 
-    assert entry.path == str(test_path)
+    assert entry.path == test_path
-    assert Path(entry.path).is_absolute()
+    assert entry.path.is_absolute()
 
 
 def test_dashboard_entry_path_with_relative_path() -> None:
     """Test DashboardEntry handles relative paths."""
-    test_path = "configs/device.yaml"
+    test_path = Path("configs/device.yaml")
     cache_key = create_cache_key()
 
     entry = DashboardEntry(test_path, cache_key)
 
     assert entry.path == test_path
-    assert not Path(entry.path).is_absolute()
+    assert not entry.path.is_absolute()
 
 
 @pytest.mark.asyncio
@@ -81,12 +81,12 @@ async def test_dashboard_entries_get_by_path(
     dashboard_entries: DashboardEntries,
 ) -> None:
     """Test getting entry by path."""
-    test_path = "/test/config/device.yaml"
+    test_path = Path("/test/config/device.yaml")
     entry = DashboardEntry(test_path, create_cache_key())
 
-    dashboard_entries._entries[test_path] = entry
+    dashboard_entries._entries[str(test_path)] = entry
 
-    result = dashboard_entries.get(test_path)
+    result = dashboard_entries.get(str(test_path))
     assert result == entry
 
 
@@ -104,12 +104,12 @@ async def test_dashboard_entries_path_normalization(
     dashboard_entries: DashboardEntries,
 ) -> None:
     """Test that paths are handled consistently."""
-    path1 = "/test/config/device.yaml"
+    path1 = Path("/test/config/device.yaml")
 
     entry = DashboardEntry(path1, create_cache_key())
-    dashboard_entries._entries[path1] = entry
+    dashboard_entries._entries[str(path1)] = entry
 
-    result = dashboard_entries.get(path1)
+    result = dashboard_entries.get(str(path1))
     assert result == entry
 
 
@@ -118,12 +118,12 @@ async def test_dashboard_entries_path_with_spaces(
     dashboard_entries: DashboardEntries,
 ) -> None:
     """Test handling paths with spaces."""
-    test_path = "/test/config/my device.yaml"
+    test_path = Path("/test/config/my device.yaml")
     entry = DashboardEntry(test_path, create_cache_key())
 
-    dashboard_entries._entries[test_path] = entry
+    dashboard_entries._entries[str(test_path)] = entry
 
-    result = dashboard_entries.get(test_path)
+    result = dashboard_entries.get(str(test_path))
     assert result == entry
     assert result.path == test_path
 
@@ -133,18 +133,18 @@ async def test_dashboard_entries_path_with_special_chars(
     dashboard_entries: DashboardEntries,
 ) -> None:
     """Test handling paths with special characters."""
-    test_path = "/test/config/device-01_test.yaml"
+    test_path = Path("/test/config/device-01_test.yaml")
     entry = DashboardEntry(test_path, create_cache_key())
 
-    dashboard_entries._entries[test_path] = entry
+    dashboard_entries._entries[str(test_path)] = entry
 
-    result = dashboard_entries.get(test_path)
+    result = dashboard_entries.get(str(test_path))
     assert result == entry
 
 
 def test_dashboard_entries_windows_path() -> None:
     """Test handling Windows-style paths."""
-    test_path = r"C:\Users\test\esphome\device.yaml"
+    test_path = Path(r"C:\Users\test\esphome\device.yaml")
     cache_key = create_cache_key()
 
     entry = DashboardEntry(test_path, cache_key)
@@ -157,28 +157,28 @@ async def test_dashboard_entries_path_to_cache_key_mapping(
     dashboard_entries: DashboardEntries,
 ) -> None:
     """Test internal entries storage with paths and cache keys."""
-    path1 = "/test/config/device1.yaml"
+    path1 = Path("/test/config/device1.yaml")
-    path2 = "/test/config/device2.yaml"
+    path2 = Path("/test/config/device2.yaml")
 
     entry1 = DashboardEntry(path1, create_cache_key())
     entry2 = DashboardEntry(path2, (1, 1, 1.0, 1))
 
-    dashboard_entries._entries[path1] = entry1
+    dashboard_entries._entries[str(path1)] = entry1
-    dashboard_entries._entries[path2] = entry2
+    dashboard_entries._entries[str(path2)] = entry2
 
-    assert path1 in dashboard_entries._entries
+    assert str(path1) in dashboard_entries._entries
-    assert path2 in dashboard_entries._entries
+    assert str(path2) in dashboard_entries._entries
-    assert dashboard_entries._entries[path1].cache_key == create_cache_key()
+    assert dashboard_entries._entries[str(path1)].cache_key == create_cache_key()
-    assert dashboard_entries._entries[path2].cache_key == (1, 1, 1.0, 1)
+    assert dashboard_entries._entries[str(path2)].cache_key == (1, 1, 1.0, 1)
 
 
 def test_dashboard_entry_path_property() -> None:
     """Test that path property returns expected value."""
-    test_path = "/test/config/device.yaml"
+    test_path = Path("/test/config/device.yaml")
     entry = DashboardEntry(test_path, create_cache_key())
 
     assert entry.path == test_path
-    assert isinstance(entry.path, str)
+    assert isinstance(entry.path, Path)
 
 
 @pytest.mark.asyncio
@@ -187,14 +187,14 @@ async def test_dashboard_entries_all_returns_entries_with_paths(
 ) -> None:
     """Test that all() returns entries with their paths intact."""
     paths = [
-        "/test/config/device1.yaml",
+        Path("/test/config/device1.yaml"),
-        "/test/config/device2.yaml",
+        Path("/test/config/device2.yaml"),
-        "/test/config/subfolder/device3.yaml",
+        Path("/test/config/subfolder/device3.yaml"),
     ]
 
     for path in paths:
         entry = DashboardEntry(path, create_cache_key())
-        dashboard_entries._entries[path] = entry
+        dashboard_entries._entries[str(path)] = entry
 
     all_entries = dashboard_entries.async_all()
 

tests/dashboard/test_settings.py

@@ -2,7 +2,6 @@
 
 from __future__ import annotations
 
-import os
 from pathlib import Path
 import tempfile
 
@@ -17,7 +16,7 @@ def dashboard_settings(tmp_path: Path) -> DashboardSettings:
     settings = DashboardSettings()
     # Resolve symlinks to ensure paths match
     resolved_dir = tmp_path.resolve()
-    settings.config_dir = str(resolved_dir)
+    settings.config_dir = resolved_dir
     settings.absolute_config_dir = resolved_dir
     return settings
 
@@ -26,7 +25,7 @@ def test_rel_path_simple(dashboard_settings: DashboardSettings) -> None:
     """Test rel_path with simple relative path."""
     result = dashboard_settings.rel_path("config.yaml")
 
-    expected = str(Path(dashboard_settings.config_dir) / "config.yaml")
+    expected = dashboard_settings.config_dir / "config.yaml"
     assert result == expected
 
 
@@ -34,9 +33,7 @@ def test_rel_path_multiple_components(dashboard_settings: DashboardSettings) ->
     """Test rel_path with multiple path components."""
     result = dashboard_settings.rel_path("subfolder", "device", "config.yaml")
 
-    expected = str(
+    expected = dashboard_settings.config_dir / "subfolder" / "device" / "config.yaml"
-        Path(dashboard_settings.config_dir) / "subfolder" / "device" / "config.yaml"
-    )
     assert result == expected
 
 
@@ -55,7 +52,7 @@ def test_rel_path_absolute_path_within_config(
 
     internal_path.touch()
     result = dashboard_settings.rel_path("internal.yaml")
-    expected = str(Path(dashboard_settings.config_dir) / "internal.yaml")
+    expected = dashboard_settings.config_dir / "internal.yaml"
     assert result == expected
 
 
@@ -80,7 +77,7 @@ def test_rel_path_with_pathlib_path(dashboard_settings: DashboardSettings) -> No
     path_obj = Path("subfolder") / "config.yaml"
     result = dashboard_settings.rel_path(path_obj)
 
-    expected = str(Path(dashboard_settings.config_dir) / "subfolder" / "config.yaml")
+    expected = dashboard_settings.config_dir / "subfolder" / "config.yaml"
     assert result == expected
 
 
@@ -93,9 +90,7 @@ def test_rel_path_normalizes_slashes(dashboard_settings: DashboardSettings) -> N
     assert result1 == result2
 
     # Also test that the result is as expected
-    expected = os.path.join(
+    expected = dashboard_settings.config_dir / "folder" / "subfolder" / "file.yaml"
-        dashboard_settings.config_dir, "folder", "subfolder", "file.yaml"
-    )
     assert result1 == expected
 
 
@@ -103,7 +98,7 @@ def test_rel_path_handles_spaces(dashboard_settings: DashboardSettings) -> None:
     """Test rel_path handles paths with spaces."""
     result = dashboard_settings.rel_path("my folder", "my config.yaml")
 
-    expected = str(Path(dashboard_settings.config_dir) / "my folder" / "my config.yaml")
+    expected = dashboard_settings.config_dir / "my folder" / "my config.yaml"
     assert result == expected
 
 
@@ -111,15 +106,13 @@ def test_rel_path_handles_special_chars(dashboard_settings: DashboardSettings) -
     """Test rel_path handles paths with special characters."""
     result = dashboard_settings.rel_path("device-01_test", "config.yaml")
 
-    expected = str(
+    expected = dashboard_settings.config_dir / "device-01_test" / "config.yaml"
-        Path(dashboard_settings.config_dir) / "device-01_test" / "config.yaml"
-    )
     assert result == expected
 
 
 def test_config_dir_as_path_property(dashboard_settings: DashboardSettings) -> None:
     """Test that config_dir can be accessed and used with Path operations."""
-    config_path = Path(dashboard_settings.config_dir)
+    config_path = dashboard_settings.config_dir
 
     assert config_path.exists()
     assert config_path.is_dir()
@@ -141,7 +134,7 @@ def test_rel_path_symlink_inside_config(dashboard_settings: DashboardSettings) -
     symlink = dashboard_settings.absolute_config_dir / "link.yaml"
     symlink.symlink_to(target)
     result = dashboard_settings.rel_path("link.yaml")
-    expected = str(Path(dashboard_settings.config_dir) / "link.yaml")
+    expected = dashboard_settings.config_dir / "link.yaml"
     assert result == expected
 
 
@@ -157,12 +150,12 @@ def test_rel_path_symlink_outside_config(dashboard_settings: DashboardSettings)
 def test_rel_path_with_none_arg(dashboard_settings: DashboardSettings) -> None:
     """Test rel_path handles None arguments gracefully."""
     result = dashboard_settings.rel_path("None")
-    expected = str(Path(dashboard_settings.config_dir) / "None")
+    expected = dashboard_settings.config_dir / "None"
     assert result == expected
 
 
 def test_rel_path_with_numeric_args(dashboard_settings: DashboardSettings) -> None:
     """Test rel_path handles numeric arguments."""
     result = dashboard_settings.rel_path("123", "456.789")
-    expected = str(Path(dashboard_settings.config_dir) / "123" / "456.789")
+    expected = dashboard_settings.config_dir / "123" / "456.789"
     assert result == expected

tests/dashboard/test_web_server.py

@@ -49,7 +49,7 @@ def mock_trash_storage_path(tmp_path: Path) -> Generator[MagicMock]:
     """Fixture to mock trash_storage_path."""
     trash_dir = tmp_path / "trash"
     with patch(
-        "esphome.dashboard.web_server.trash_storage_path", return_value=str(trash_dir)
+        "esphome.dashboard.web_server.trash_storage_path", return_value=trash_dir
     ) as mock:
         yield mock
 
@@ -60,7 +60,7 @@ def mock_archive_storage_path(tmp_path: Path) -> Generator[MagicMock]:
     archive_dir = tmp_path / "archive"
     with patch(
         "esphome.dashboard.web_server.archive_storage_path",
-        return_value=str(archive_dir),
+        return_value=archive_dir,
     ) as mock:
         yield mock
 
@@ -257,7 +257,7 @@ async def test_download_binary_handler_with_file(
     # Mock storage JSON
     mock_storage = Mock()
     mock_storage.name = "test_device"
-    mock_storage.firmware_bin_path = str(firmware_file)
+    mock_storage.firmware_bin_path = firmware_file
     mock_storage_json.load.return_value = mock_storage
 
     response = await dashboard.fetch(
@@ -289,7 +289,7 @@ async def test_download_binary_handler_compressed(
     # Mock storage JSON
     mock_storage = Mock()
     mock_storage.name = "test_device"
-    mock_storage.firmware_bin_path = str(firmware_file)
+    mock_storage.firmware_bin_path = firmware_file
     mock_storage_json.load.return_value = mock_storage
 
     response = await dashboard.fetch(
@@ -321,7 +321,7 @@ async def test_download_binary_handler_custom_download_name(
     # Mock storage JSON
     mock_storage = Mock()
     mock_storage.name = "test_device"
-    mock_storage.firmware_bin_path = str(firmware_file)
+    mock_storage.firmware_bin_path = firmware_file
     mock_storage_json.load.return_value = mock_storage
 
     response = await dashboard.fetch(
@@ -355,7 +355,7 @@ async def test_download_binary_handler_idedata_fallback(
     # Mock storage JSON
     mock_storage = Mock()
     mock_storage.name = "test_device"
-    mock_storage.firmware_bin_path = str(firmware_file)
+    mock_storage.firmware_bin_path = firmware_file
     mock_storage_json.load.return_value = mock_storage
 
     # Mock idedata response
@@ -402,7 +402,7 @@ async def test_edit_request_handler_post_existing(
     test_file.write_text("esphome:\n  name: original\n")
 
     # Configure the mock settings
-    mock_dashboard_settings.rel_path.return_value = str(test_file)
+    mock_dashboard_settings.rel_path.return_value = test_file
     mock_dashboard_settings.absolute_config_dir = test_file.parent
 
     new_content = "esphome:\n  name: modified\n"
@@ -426,7 +426,7 @@ async def test_unarchive_request_handler(
 ) -> None:
     """Test the UnArchiveRequestHandler.post method."""
     # Set up an archived file
-    archive_dir = Path(mock_archive_storage_path.return_value)
+    archive_dir = mock_archive_storage_path.return_value
     archive_dir.mkdir(parents=True, exist_ok=True)
     archived_file = archive_dir / "archived.yaml"
     archived_file.write_text("test content")
@@ -435,7 +435,7 @@ async def test_unarchive_request_handler(
     config_dir = tmp_path / "config"
     config_dir.mkdir(parents=True, exist_ok=True)
     destination_file = config_dir / "archived.yaml"
-    mock_dashboard_settings.rel_path.return_value = str(destination_file)
+    mock_dashboard_settings.rel_path.return_value = destination_file
 
     response = await dashboard.fetch(
         "/unarchive?configuration=archived.yaml",
@@ -474,7 +474,7 @@ async def test_secret_keys_handler_with_file(
 
     # Configure mock to return our temp secrets file
     # Since the file actually exists, os.path.isfile will return True naturally
-    mock_dashboard_settings.rel_path.return_value = str(secrets_file)
+    mock_dashboard_settings.rel_path.return_value = secrets_file
 
     response = await dashboard.fetch("/secret_keys", method="GET")
     assert response.code == 200
@@ -538,8 +538,8 @@ def test_start_web_server_with_address_port(
 ) -> None:
     """Test the start_web_server function with address and port."""
     app = Mock()
-    trash_dir = Path(mock_trash_storage_path.return_value)
+    trash_dir = mock_trash_storage_path.return_value
-    archive_dir = Path(mock_archive_storage_path.return_value)
+    archive_dir = mock_archive_storage_path.return_value
 
     # Create trash dir to test migration
     trash_dir.mkdir()
@@ -643,12 +643,12 @@ async def test_archive_handler_with_build_folder(
     (build_folder / ".pioenvs").mkdir()
 
     mock_dashboard_settings.config_dir = str(config_dir)
-    mock_dashboard_settings.rel_path.return_value = str(test_config)
+    mock_dashboard_settings.rel_path.return_value = test_config
-    mock_archive_storage_path.return_value = str(archive_dir)
+    mock_archive_storage_path.return_value = archive_dir
 
     mock_storage = MagicMock()
     mock_storage.name = "test_device"
-    mock_storage.build_path = str(build_folder)
+    mock_storage.build_path = build_folder
     mock_storage_json.load.return_value = mock_storage
 
     response = await dashboard.fetch(
@@ -686,8 +686,8 @@ async def test_archive_handler_no_build_folder(
     test_config.write_text("esphome:\n  name: test_device\n")
 
     mock_dashboard_settings.config_dir = str(config_dir)
-    mock_dashboard_settings.rel_path.return_value = str(test_config)
+    mock_dashboard_settings.rel_path.return_value = test_config
-    mock_archive_storage_path.return_value = str(archive_dir)
+    mock_archive_storage_path.return_value = archive_dir
 
     mock_storage = MagicMock()
     mock_storage.name = "test_device"

tests/dashboard/test_web_server_paths.py

@@ -13,14 +13,14 @@ from esphome.dashboard import web_server
 def test_get_base_frontend_path_production() -> None:
     """Test get_base_frontend_path in production mode."""
     mock_module = MagicMock()
-    mock_module.where.return_value = "/usr/local/lib/esphome_dashboard"
+    mock_module.where.return_value = Path("/usr/local/lib/esphome_dashboard")
 
     with (
         patch.dict(os.environ, {}, clear=True),
         patch.dict("sys.modules", {"esphome_dashboard": mock_module}),
     ):
         result = web_server.get_base_frontend_path()
-        assert result == "/usr/local/lib/esphome_dashboard"
+        assert result == Path("/usr/local/lib/esphome_dashboard")
         mock_module.where.assert_called_once()
 
 
@@ -31,13 +31,12 @@ def test_get_base_frontend_path_dev_mode() -> None:
     with patch.dict(os.environ, {"ESPHOME_DASHBOARD_DEV": test_path}):
         result = web_server.get_base_frontend_path()
 
-        # The function uses os.path.abspath which doesn't resolve symlinks
+        # The function uses Path.resolve() which resolves symlinks
-        # We need to match that behavior
         # The actual function adds "/" to the path, so we simulate that
         test_path_with_slash = test_path if test_path.endswith("/") else test_path + "/"
-        expected = os.path.abspath(
+        expected = (
-            os.path.join(os.getcwd(), test_path_with_slash, "esphome_dashboard")
+            Path(os.getcwd()) / test_path_with_slash / "esphome_dashboard"
-        )
+        ).resolve()
         assert result == expected
 
 
@@ -48,8 +47,8 @@ def test_get_base_frontend_path_dev_mode_with_trailing_slash() -> None:
     with patch.dict(os.environ, {"ESPHOME_DASHBOARD_DEV": test_path}):
         result = web_server.get_base_frontend_path()
 
-        # The function uses os.path.abspath which doesn't resolve symlinks
+        # The function uses Path.resolve() which resolves symlinks
-        expected = os.path.abspath(str(Path.cwd() / test_path / "esphome_dashboard"))
+        expected = (Path.cwd() / test_path / "esphome_dashboard").resolve()
         assert result == expected
 
 
@@ -60,76 +59,72 @@ def test_get_base_frontend_path_dev_mode_relative_path() -> None:
     with patch.dict(os.environ, {"ESPHOME_DASHBOARD_DEV": test_path}):
         result = web_server.get_base_frontend_path()
 
-        # The function uses os.path.abspath which doesn't resolve symlinks
+        # The function uses Path.resolve() which resolves symlinks
-        # We need to match that behavior
         # The actual function adds "/" to the path, so we simulate that
         test_path_with_slash = test_path if test_path.endswith("/") else test_path + "/"
-        expected = os.path.abspath(
+        expected = (
-            os.path.join(os.getcwd(), test_path_with_slash, "esphome_dashboard")
+            Path(os.getcwd()) / test_path_with_slash / "esphome_dashboard"
-        )
+        ).resolve()
         assert result == expected
-        assert Path(result).is_absolute()
+        assert result.is_absolute()
 
 
 def test_get_static_path_single_component() -> None:
     """Test get_static_path with single path component."""
     with patch("esphome.dashboard.web_server.get_base_frontend_path") as mock_base:
-        mock_base.return_value = "/base/frontend"
+        mock_base.return_value = Path("/base/frontend")
 
         result = web_server.get_static_path("file.js")
 
-        assert result == os.path.join("/base/frontend", "static", "file.js")
+        assert result == Path("/base/frontend") / "static" / "file.js"
 
 
 def test_get_static_path_multiple_components() -> None:
     """Test get_static_path with multiple path components."""
     with patch("esphome.dashboard.web_server.get_base_frontend_path") as mock_base:
-        mock_base.return_value = "/base/frontend"
+        mock_base.return_value = Path("/base/frontend")
 
         result = web_server.get_static_path("js", "esphome", "index.js")
 
-        assert result == os.path.join(
+        assert (
-            "/base/frontend", "static", "js", "esphome", "index.js"
+            result == Path("/base/frontend") / "static" / "js" / "esphome" / "index.js"
         )
 
 
 def test_get_static_path_empty_args() -> None:
     """Test get_static_path with no arguments."""
     with patch("esphome.dashboard.web_server.get_base_frontend_path") as mock_base:
-        mock_base.return_value = "/base/frontend"
+        mock_base.return_value = Path("/base/frontend")
 
         result = web_server.get_static_path()
 
-        assert result == os.path.join("/base/frontend", "static")
+        assert result == Path("/base/frontend") / "static"
 
 
 def test_get_static_path_with_pathlib_path() -> None:
     """Test get_static_path with Path objects."""
     with patch("esphome.dashboard.web_server.get_base_frontend_path") as mock_base:
-        mock_base.return_value = "/base/frontend"
+        mock_base.return_value = Path("/base/frontend")
 
         path_obj = Path("js") / "app.js"
         result = web_server.get_static_path(str(path_obj))
 
-        assert result == os.path.join("/base/frontend", "static", "js", "app.js")
+        assert result == Path("/base/frontend") / "static" / "js" / "app.js"
 
 
 def test_get_static_file_url_production() -> None:
     """Test get_static_file_url in production mode."""
     web_server.get_static_file_url.cache_clear()
     mock_module = MagicMock()
-    mock_file = MagicMock()
+    mock_path = MagicMock(spec=Path)
-    mock_file.read.return_value = b"test content"
+    mock_path.read_bytes.return_value = b"test content"
-    mock_file.__enter__ = MagicMock(return_value=mock_file)
-    mock_file.__exit__ = MagicMock(return_value=None)
 
     with (
         patch.dict(os.environ, {}, clear=True),
         patch.dict("sys.modules", {"esphome_dashboard": mock_module}),
         patch("esphome.dashboard.web_server.get_static_path") as mock_get_path,
-        patch("esphome.dashboard.web_server.open", create=True, return_value=mock_file),
     ):
-        mock_get_path.return_value = "/fake/path/js/app.js"
+        mock_get_path.return_value = mock_path
         result = web_server.get_static_file_url("js/app.js")
         assert result.startswith("./static/js/app.js?hash=")
 
@@ -182,26 +177,26 @@ def test_load_file_compressed_path(tmp_path: Path) -> None:
 def test_path_normalization_in_static_path() -> None:
     """Test that paths are normalized correctly."""
     with patch("esphome.dashboard.web_server.get_base_frontend_path") as mock_base:
-        mock_base.return_value = "/base/frontend"
+        mock_base.return_value = Path("/base/frontend")
 
         # Test with separate components
         result1 = web_server.get_static_path("js", "app.js")
         result2 = web_server.get_static_path("js", "app.js")
 
         assert result1 == result2
-        assert result1 == os.path.join("/base/frontend", "static", "js", "app.js")
+        assert result1 == Path("/base/frontend") / "static" / "js" / "app.js"
 
 
 def test_windows_path_handling() -> None:
     """Test handling of Windows-style paths."""
     with patch("esphome.dashboard.web_server.get_base_frontend_path") as mock_base:
-        mock_base.return_value = r"C:\Program Files\esphome\frontend"
+        mock_base.return_value = Path(r"C:\Program Files\esphome\frontend")
 
         result = web_server.get_static_path("js", "app.js")
 
-        # os.path.join should handle this correctly on the platform
+        # Path should handle this correctly on the platform
-        expected = os.path.join(
+        expected = (
-            r"C:\Program Files\esphome\frontend", "static", "js", "app.js"
+            Path(r"C:\Program Files\esphome\frontend") / "static" / "js" / "app.js"
         )
         assert result == expected
 
@@ -209,22 +204,20 @@ def test_windows_path_handling() -> None:
 def test_path_with_special_characters() -> None:
     """Test paths with special characters."""
     with patch("esphome.dashboard.web_server.get_base_frontend_path") as mock_base:
-        mock_base.return_value = "/base/frontend"
+        mock_base.return_value = Path("/base/frontend")
 
         result = web_server.get_static_path("js-modules", "app_v1.0.js")
 
-        assert result == os.path.join(
+        assert (
-            "/base/frontend", "static", "js-modules", "app_v1.0.js"
+            result == Path("/base/frontend") / "static" / "js-modules" / "app_v1.0.js"
         )
 
 
 def test_path_with_spaces() -> None:
     """Test paths with spaces."""
     with patch("esphome.dashboard.web_server.get_base_frontend_path") as mock_base:
-        mock_base.return_value = "/base/my frontend"
+        mock_base.return_value = Path("/base/my frontend")
 
         result = web_server.get_static_path("my js", "my app.js")
 
-        assert result == os.path.join(
+        assert result == Path("/base/my frontend") / "static" / "my js" / "my app.js"
-            "/base/my frontend", "static", "my js", "my app.js"
-        )

tests/dashboard/util/test_file.py

@@ -1,56 +0,0 @@
-import os
-from pathlib import Path
-from unittest.mock import patch
-
-import py
-import pytest
-
-from esphome.dashboard.util.file import write_file, write_utf8_file
-
-
-def test_write_utf8_file(tmp_path: Path) -> None:
-    write_utf8_file(tmp_path.joinpath("foo.txt"), "foo")
-    assert tmp_path.joinpath("foo.txt").read_text() == "foo"
-
-    with pytest.raises(OSError):
-        write_utf8_file(Path("/dev/not-writable"), "bar")
-
-
-def test_write_file(tmp_path: Path) -> None:
-    write_file(tmp_path.joinpath("foo.txt"), b"foo")
-    assert tmp_path.joinpath("foo.txt").read_text() == "foo"
-
-
-def test_write_utf8_file_fails_at_rename(
-    tmpdir: py.path.local, caplog: pytest.LogCaptureFixture
-) -> None:
-    """Test that if rename fails not not remove, we do not log the failed cleanup."""
-    test_dir = tmpdir.mkdir("files")
-    test_file = Path(test_dir / "test.json")
-
-    with (
-        pytest.raises(OSError),
-        patch("esphome.dashboard.util.file.os.replace", side_effect=OSError),
-    ):
-        write_utf8_file(test_file, '{"some":"data"}', False)
-
-    assert not os.path.exists(test_file)
-
-    assert "File replacement cleanup failed" not in caplog.text
-
-
-def test_write_utf8_file_fails_at_rename_and_remove(
-    tmpdir: py.path.local, caplog: pytest.LogCaptureFixture
-) -> None:
-    """Test that if rename and remove both fail, we log the failed cleanup."""
-    test_dir = tmpdir.mkdir("files")
-    test_file = Path(test_dir / "test.json")
-
-    with (
-        pytest.raises(OSError),
-        patch("esphome.dashboard.util.file.os.remove", side_effect=OSError),
-        patch("esphome.dashboard.util.file.os.replace", side_effect=OSError),
-    ):
-        write_utf8_file(test_file, '{"some":"data"}', False)
-
-    assert "File replacement cleanup failed" in caplog.text

tests/integration/conftest.py

@@ -271,7 +271,7 @@ async def compile_esphome(
 
         def _read_config_and_get_binary():
             CORE.reset()  # Reset CORE state between test runs
-            CORE.config_path = str(config_path)
+            CORE.config_path = config_path
             config = esphome.config.read_config(
                 {"command": "compile", "config": str(config_path)}
             )

tests/unit_tests/build_gen/test_platformio.py

@@ -172,7 +172,7 @@ def test_write_ini_no_change_when_content_same(
     # write_file_if_changed should be called with the same content
     mock_write_file_if_changed.assert_called_once()
     call_args = mock_write_file_if_changed.call_args[0]
-    assert call_args[0] == str(ini_file)
+    assert call_args[0] == ini_file
     assert content in call_args[1]
 
 

tests/unit_tests/conftest.py

@@ -43,7 +43,7 @@ def fixture_path() -> Path:
 @pytest.fixture
 def setup_core(tmp_path: Path) -> Path:
     """Set up CORE with test paths."""
-    CORE.config_path = str(tmp_path / "test.yaml")
+    CORE.config_path = tmp_path / "test.yaml"
     return tmp_path
 
 

tests/unit_tests/core/common.py

@@ -10,7 +10,7 @@ from esphome.core import CORE
 
 
 def load_config_from_yaml(
-    yaml_file: Callable[[str], str], yaml_content: str
+    yaml_file: Callable[[str], Path], yaml_content: str
 ) -> Config | None:
     """Load configuration from YAML content."""
     yaml_path = yaml_file(yaml_content)
@@ -25,7 +25,7 @@ def load_config_from_yaml(
 
 
 def load_config_from_fixture(
-    yaml_file: Callable[[str], str], fixture_name: str, fixtures_dir: Path
+    yaml_file: Callable[[str], Path], fixture_name: str, fixtures_dir: Path
 ) -> Config | None:
     """Load configuration from a fixture file."""
     fixture_path = fixtures_dir / fixture_name

tests/unit_tests/core/conftest.py

@@ -7,12 +7,12 @@ import pytest
 
 
 @pytest.fixture
-def yaml_file(tmp_path: Path) -> Callable[[str], str]:
+def yaml_file(tmp_path: Path) -> Callable[[str], Path]:
     """Create a temporary YAML file for testing."""
 
-    def _yaml_file(content: str) -> str:
+    def _yaml_file(content: str) -> Path:
         yaml_path = tmp_path / "test.yaml"
         yaml_path.write_text(content)
-        return str(yaml_path)
+        return yaml_path
 
     return _yaml_file

tests/unit_tests/core/test_config.py

@@ -289,7 +289,7 @@ def test_valid_include_with_angle_brackets() -> None:
 
 def test_valid_include_with_valid_file(tmp_path: Path) -> None:
     """Test valid_include accepts valid include files."""
-    CORE.config_path = str(tmp_path / "test.yaml")
+    CORE.config_path = tmp_path / "test.yaml"
     include_file = tmp_path / "include.h"
     include_file.touch()
 
@@ -298,7 +298,7 @@ def test_valid_include_with_valid_file(tmp_path: Path) -> None:
 
 def test_valid_include_with_valid_directory(tmp_path: Path) -> None:
     """Test valid_include accepts valid directories."""
-    CORE.config_path = str(tmp_path / "test.yaml")
+    CORE.config_path = tmp_path / "test.yaml"
     include_dir = tmp_path / "includes"
     include_dir.mkdir()
 
@@ -307,7 +307,7 @@ def test_valid_include_with_valid_directory(tmp_path: Path) -> None:
 
 def test_valid_include_invalid_extension(tmp_path: Path) -> None:
     """Test valid_include rejects files with invalid extensions."""
-    CORE.config_path = str(tmp_path / "test.yaml")
+    CORE.config_path = tmp_path / "test.yaml"
     invalid_file = tmp_path / "file.txt"
     invalid_file.touch()
 
@@ -481,7 +481,7 @@ def test_include_file_header(tmp_path: Path, mock_copy_file_if_changed: Mock) ->
     src_file = tmp_path / "source.h"
     src_file.write_text("// Header content")
 
-    CORE.build_path = str(tmp_path / "build")
+    CORE.build_path = tmp_path / "build"
 
     with patch("esphome.core.config.cg") as mock_cg:
         # Mock RawStatement to capture the text
@@ -494,7 +494,7 @@ def test_include_file_header(tmp_path: Path, mock_copy_file_if_changed: Mock) ->
 
         mock_cg.RawStatement.side_effect = raw_statement_side_effect
 
-        config.include_file(str(src_file), "test.h")
+        config.include_file(src_file, Path("test.h"))
 
         mock_copy_file_if_changed.assert_called_once()
         mock_cg.add_global.assert_called_once()
@@ -507,10 +507,10 @@ def test_include_file_cpp(tmp_path: Path, mock_copy_file_if_changed: Mock) -> No
     src_file = tmp_path / "source.cpp"
     src_file.write_text("// CPP content")
 
-    CORE.build_path = str(tmp_path / "build")
+    CORE.build_path = tmp_path / "build"
 
     with patch("esphome.core.config.cg") as mock_cg:
-        config.include_file(str(src_file), "test.cpp")
+        config.include_file(src_file, Path("test.cpp"))
 
         mock_copy_file_if_changed.assert_called_once()
         # Should not add include statement for .cpp files
@@ -602,8 +602,8 @@ async def test_add_includes_with_single_file(
     mock_cg_with_include_capture: tuple[Mock, list[str]],
 ) -> None:
     """Test add_includes copies a single header file to build directory."""
-    CORE.config_path = str(tmp_path / "config.yaml")
+    CORE.config_path = tmp_path / "config.yaml"
-    CORE.build_path = str(tmp_path / "build")
+    CORE.build_path = tmp_path / "build"
     os.makedirs(CORE.build_path, exist_ok=True)
 
     # Create include file
@@ -617,7 +617,7 @@ async def test_add_includes_with_single_file(
     # Verify copy_file_if_changed was called to copy the file
     # Note: add_includes adds files to a src/ subdirectory
     mock_copy_file_if_changed.assert_called_once_with(
-        str(include_file), str(Path(CORE.build_path) / "src" / "my_header.h")
+        include_file, CORE.build_path / "src" / "my_header.h"
     )
 
     # Verify include statement was added
@@ -632,8 +632,8 @@ async def test_add_includes_with_directory_unix(
     mock_cg_with_include_capture: tuple[Mock, list[str]],
 ) -> None:
     """Test add_includes copies all files from a directory on Unix."""
-    CORE.config_path = str(tmp_path / "config.yaml")
+    CORE.config_path = tmp_path / "config.yaml"
-    CORE.build_path = str(tmp_path / "build")
+    CORE.build_path = tmp_path / "build"
     os.makedirs(CORE.build_path, exist_ok=True)
 
     # Create include directory with files
@@ -677,8 +677,8 @@ async def test_add_includes_with_directory_windows(
     mock_cg_with_include_capture: tuple[Mock, list[str]],
 ) -> None:
     """Test add_includes copies all files from a directory on Windows."""
-    CORE.config_path = str(tmp_path / "config.yaml")
+    CORE.config_path = tmp_path / "config.yaml"
-    CORE.build_path = str(tmp_path / "build")
+    CORE.build_path = tmp_path / "build"
     os.makedirs(CORE.build_path, exist_ok=True)
 
     # Create include directory with files
@@ -719,8 +719,8 @@ async def test_add_includes_with_multiple_sources(
     tmp_path: Path, mock_copy_file_if_changed: Mock
 ) -> None:
     """Test add_includes with multiple files and directories."""
-    CORE.config_path = str(tmp_path / "config.yaml")
+    CORE.config_path = tmp_path / "config.yaml"
-    CORE.build_path = str(tmp_path / "build")
+    CORE.build_path = tmp_path / "build"
     os.makedirs(CORE.build_path, exist_ok=True)
 
     # Create various include sources
@@ -747,8 +747,8 @@ async def test_add_includes_empty_directory(
     tmp_path: Path, mock_copy_file_if_changed: Mock
 ) -> None:
     """Test add_includes with an empty directory doesn't fail."""
-    CORE.config_path = str(tmp_path / "config.yaml")
+    CORE.config_path = tmp_path / "config.yaml"
-    CORE.build_path = str(tmp_path / "build")
+    CORE.build_path = tmp_path / "build"
     os.makedirs(CORE.build_path, exist_ok=True)
 
     # Create empty directory
@@ -769,8 +769,8 @@ async def test_add_includes_preserves_directory_structure_unix(
     tmp_path: Path, mock_copy_file_if_changed: Mock
 ) -> None:
     """Test that add_includes preserves relative directory structure on Unix."""
-    CORE.config_path = str(tmp_path / "config.yaml")
+    CORE.config_path = tmp_path / "config.yaml"
-    CORE.build_path = str(tmp_path / "build")
+    CORE.build_path = tmp_path / "build"
     os.makedirs(CORE.build_path, exist_ok=True)
 
     # Create nested directory structure
@@ -793,8 +793,8 @@ async def test_add_includes_preserves_directory_structure_unix(
     dest_paths = [call[0][1] for call in calls]
 
     # Check that relative paths are preserved
-    assert any("lib/src/core.h" in path for path in dest_paths)
+    assert any("lib/src/core.h" in str(path) for path in dest_paths)
-    assert any("lib/utils/helper.h" in path for path in dest_paths)
+    assert any("lib/utils/helper.h" in str(path) for path in dest_paths)
 
 
 @pytest.mark.asyncio
@@ -803,8 +803,8 @@ async def test_add_includes_preserves_directory_structure_windows(
     tmp_path: Path, mock_copy_file_if_changed: Mock
 ) -> None:
     """Test that add_includes preserves relative directory structure on Windows."""
-    CORE.config_path = str(tmp_path / "config.yaml")
+    CORE.config_path = tmp_path / "config.yaml"
-    CORE.build_path = str(tmp_path / "build")
+    CORE.build_path = tmp_path / "build"
     os.makedirs(CORE.build_path, exist_ok=True)
 
     # Create nested directory structure
@@ -827,8 +827,8 @@ async def test_add_includes_preserves_directory_structure_windows(
     dest_paths = [call[0][1] for call in calls]
 
     # Check that relative paths are preserved
-    assert any("lib\\src\\core.h" in path for path in dest_paths)
+    assert any("lib\\src\\core.h" in str(path) for path in dest_paths)
-    assert any("lib\\utils\\helper.h" in path for path in dest_paths)
+    assert any("lib\\utils\\helper.h" in str(path) for path in dest_paths)
 
 
 @pytest.mark.asyncio
@@ -836,8 +836,8 @@ async def test_add_includes_overwrites_existing_files(
     tmp_path: Path, mock_copy_file_if_changed: Mock
 ) -> None:
     """Test that add_includes overwrites existing files in build directory."""
-    CORE.config_path = str(tmp_path / "config.yaml")
+    CORE.config_path = tmp_path / "config.yaml"
-    CORE.build_path = str(tmp_path / "build")
+    CORE.build_path = tmp_path / "build"
     os.makedirs(CORE.build_path, exist_ok=True)
 
     # Create include file
@@ -850,5 +850,5 @@ async def test_add_includes_overwrites_existing_files(
     # Verify copy_file_if_changed was called (it handles overwriting)
     # Note: add_includes adds files to a src/ subdirectory
     mock_copy_file_if_changed.assert_called_once_with(
-        str(include_file), str(Path(CORE.build_path) / "src" / "header.h")
+        include_file, CORE.build_path / "src" / "header.h"
     )

tests/unit_tests/test_config_validation_paths.py

@@ -15,7 +15,7 @@ def test_directory_valid_path(setup_core: Path) -> None:
 
     result = cv.directory("test_directory")
 
-    assert result == "test_directory"
+    assert result == test_dir
 
 
 def test_directory_absolute_path(setup_core: Path) -> None:
@@ -25,7 +25,7 @@ def test_directory_absolute_path(setup_core: Path) -> None:
 
     result = cv.directory(str(test_dir))
 
-    assert result == str(test_dir)
+    assert result == test_dir
 
 
 def test_directory_nonexistent_path(setup_core: Path) -> None:
@@ -52,7 +52,7 @@ def test_directory_with_parent_directory(setup_core: Path) -> None:
 
     result = cv.directory("parent/child/grandchild")
 
-    assert result == "parent/child/grandchild"
+    assert result == nested_dir
 
 
 def test_file_valid_path(setup_core: Path) -> None:
@@ -62,7 +62,7 @@ def test_file_valid_path(setup_core: Path) -> None:
 
     result = cv.file_("test_file.yaml")
 
-    assert result == "test_file.yaml"
+    assert result == test_file
 
 
 def test_file_absolute_path(setup_core: Path) -> None:
@@ -72,7 +72,7 @@ def test_file_absolute_path(setup_core: Path) -> None:
 
     result = cv.file_(str(test_file))
 
-    assert result == str(test_file)
+    assert result == test_file
 
 
 def test_file_nonexistent_path(setup_core: Path) -> None:
@@ -99,7 +99,7 @@ def test_file_with_parent_directory(setup_core: Path) -> None:
 
     result = cv.file_("configs/sensors/temperature.yaml")
 
-    assert result == "configs/sensors/temperature.yaml"
+    assert result == test_file
 
 
 def test_directory_handles_trailing_slash(setup_core: Path) -> None:
@@ -108,29 +108,29 @@ def test_directory_handles_trailing_slash(setup_core: Path) -> None:
     test_dir.mkdir()
 
     result = cv.directory("test_dir/")
-    assert result == "test_dir/"
+    assert result == test_dir
 
     result = cv.directory("test_dir")
-    assert result == "test_dir"
+    assert result == test_dir
 
 
 def test_file_handles_various_extensions(setup_core: Path) -> None:
     """Test file_ validator works with different file extensions."""
     yaml_file = setup_core / "config.yaml"
     yaml_file.write_text("yaml content")
-    assert cv.file_("config.yaml") == "config.yaml"
+    assert cv.file_("config.yaml") == yaml_file
 
     yml_file = setup_core / "config.yml"
     yml_file.write_text("yml content")
-    assert cv.file_("config.yml") == "config.yml"
+    assert cv.file_("config.yml") == yml_file
 
     txt_file = setup_core / "readme.txt"
     txt_file.write_text("text content")
-    assert cv.file_("readme.txt") == "readme.txt"
+    assert cv.file_("readme.txt") == txt_file
 
     no_ext_file = setup_core / "LICENSE"
     no_ext_file.write_text("license content")
-    assert cv.file_("LICENSE") == "LICENSE"
+    assert cv.file_("LICENSE") == no_ext_file
 
 
 def test_directory_with_symlink(setup_core: Path) -> None:
@@ -142,7 +142,7 @@ def test_directory_with_symlink(setup_core: Path) -> None:
     symlink_dir.symlink_to(actual_dir)
 
     result = cv.directory("symlink_directory")
-    assert result == "symlink_directory"
+    assert result == symlink_dir
 
 
 def test_file_with_symlink(setup_core: Path) -> None:
@@ -154,7 +154,7 @@ def test_file_with_symlink(setup_core: Path) -> None:
     symlink_file.symlink_to(actual_file)
 
     result = cv.file_("symlink_file.txt")
-    assert result == "symlink_file.txt"
+    assert result == symlink_file
 
 
 def test_directory_error_shows_full_path(setup_core: Path) -> None:
@@ -175,7 +175,7 @@ def test_directory_with_spaces_in_name(setup_core: Path) -> None:
     dir_with_spaces.mkdir()
 
     result = cv.directory("my test directory")
-    assert result == "my test directory"
+    assert result == dir_with_spaces
 
 
 def test_file_with_spaces_in_name(setup_core: Path) -> None:
@@ -184,4 +184,4 @@ def test_file_with_spaces_in_name(setup_core: Path) -> None:
     file_with_spaces.write_text("content")
 
     result = cv.file_("my test file.yaml")
-    assert result == "my test file.yaml"
+    assert result == file_with_spaces

tests/unit_tests/test_core.py

@@ -1,4 +1,5 @@
 import os
+from pathlib import Path
 from unittest.mock import patch
 
 from hypothesis import given
@@ -536,8 +537,8 @@ class TestEsphomeCore:
     @pytest.fixture
     def target(self, fixture_path):
         target = core.EsphomeCore()
-        target.build_path = "foo/build"
+        target.build_path = Path("foo/build")
-        target.config_path = "foo/config"
+        target.config_path = Path("foo/config")
         return target
 
     def test_reset(self, target):
@@ -584,33 +585,33 @@ class TestEsphomeCore:
     @pytest.mark.skipif(os.name == "nt", reason="Unix-specific test")
     def test_data_dir_default_unix(self, target):
         """Test data_dir returns .esphome in config directory by default on Unix."""
-        target.config_path = "/home/user/config.yaml"
+        target.config_path = Path("/home/user/config.yaml")
-        assert target.data_dir == "/home/user/.esphome"
+        assert target.data_dir == Path("/home/user/.esphome")
 
     @pytest.mark.skipif(os.name != "nt", reason="Windows-specific test")
     def test_data_dir_default_windows(self, target):
         """Test data_dir returns .esphome in config directory by default on Windows."""
-        target.config_path = "D:\\home\\user\\config.yaml"
+        target.config_path = Path("D:\\home\\user\\config.yaml")
-        assert target.data_dir == "D:\\home\\user\\.esphome"
+        assert target.data_dir == Path("D:\\home\\user\\.esphome")
 
     def test_data_dir_ha_addon(self, target):
         """Test data_dir returns /data when running as Home Assistant addon."""
-        target.config_path = "/config/test.yaml"
+        target.config_path = Path("/config/test.yaml")
 
         with patch.dict(os.environ, {"ESPHOME_IS_HA_ADDON": "true"}):
-            assert target.data_dir == "/data"
+            assert target.data_dir == Path("/data")
 
     def test_data_dir_env_override(self, target):
         """Test data_dir uses ESPHOME_DATA_DIR environment variable when set."""
-        target.config_path = "/home/user/config.yaml"
+        target.config_path = Path("/home/user/config.yaml")
 
         with patch.dict(os.environ, {"ESPHOME_DATA_DIR": "/custom/data/path"}):
-            assert target.data_dir == "/custom/data/path"
+            assert target.data_dir == Path("/custom/data/path")
 
     @pytest.mark.skipif(os.name == "nt", reason="Unix-specific test")
     def test_data_dir_priority_unix(self, target):
         """Test data_dir priority on Unix: HA addon > env var > default."""
-        target.config_path = "/config/test.yaml"
+        target.config_path = Path("/config/test.yaml")
         expected_default = "/config/.esphome"
 
         # Test HA addon takes priority over env var
@@ -618,26 +619,26 @@ class TestEsphomeCore:
             os.environ,
             {"ESPHOME_IS_HA_ADDON": "true", "ESPHOME_DATA_DIR": "/custom/path"},
         ):
-            assert target.data_dir == "/data"
+            assert target.data_dir == Path("/data")
 
         # Test env var is used when not HA addon
         with patch.dict(
             os.environ,
             {"ESPHOME_IS_HA_ADDON": "false", "ESPHOME_DATA_DIR": "/custom/path"},
         ):
-            assert target.data_dir == "/custom/path"
+            assert target.data_dir == Path("/custom/path")
 
         # Test default when neither is set
         with patch.dict(os.environ, {}, clear=True):
             # Ensure these env vars are not set
             os.environ.pop("ESPHOME_IS_HA_ADDON", None)
             os.environ.pop("ESPHOME_DATA_DIR", None)
-            assert target.data_dir == expected_default
+            assert target.data_dir == Path(expected_default)
 
     @pytest.mark.skipif(os.name != "nt", reason="Windows-specific test")
     def test_data_dir_priority_windows(self, target):
         """Test data_dir priority on Windows: HA addon > env var > default."""
-        target.config_path = "D:\\config\\test.yaml"
+        target.config_path = Path("D:\\config\\test.yaml")
         expected_default = "D:\\config\\.esphome"
 
         # Test HA addon takes priority over env var
@@ -645,18 +646,18 @@ class TestEsphomeCore:
             os.environ,
             {"ESPHOME_IS_HA_ADDON": "true", "ESPHOME_DATA_DIR": "/custom/path"},
         ):
-            assert target.data_dir == "/data"
+            assert target.data_dir == Path("/data")
 
         # Test env var is used when not HA addon
         with patch.dict(
             os.environ,
             {"ESPHOME_IS_HA_ADDON": "false", "ESPHOME_DATA_DIR": "/custom/path"},
         ):
-            assert target.data_dir == "/custom/path"
+            assert target.data_dir == Path("/custom/path")
 
         # Test default when neither is set
         with patch.dict(os.environ, {}, clear=True):
             # Ensure these env vars are not set
             os.environ.pop("ESPHOME_IS_HA_ADDON", None)
             os.environ.pop("ESPHOME_DATA_DIR", None)
-            assert target.data_dir == expected_default
+            assert target.data_dir == Path(expected_default)

tests/unit_tests/test_external_files.py

@@ -42,7 +42,7 @@ def test_is_file_recent_with_recent_file(setup_core: Path) -> None:
 
     refresh = TimePeriod(seconds=3600)
 
-    result = external_files.is_file_recent(str(test_file), refresh)
+    result = external_files.is_file_recent(test_file, refresh)
 
     assert result is True
 
@@ -53,11 +53,13 @@ def test_is_file_recent_with_old_file(setup_core: Path) -> None:
     test_file.write_text("content")
 
     old_time = time.time() - 7200
+    mock_stat = MagicMock()
+    mock_stat.st_ctime = old_time
 
-    with patch("os.path.getctime", return_value=old_time):
+    with patch.object(Path, "stat", return_value=mock_stat):
         refresh = TimePeriod(seconds=3600)
 
-        result = external_files.is_file_recent(str(test_file), refresh)
+        result = external_files.is_file_recent(test_file, refresh)
 
         assert result is False
 
@@ -67,7 +69,7 @@ def test_is_file_recent_nonexistent_file(setup_core: Path) -> None:
     test_file = setup_core / "nonexistent.txt"
     refresh = TimePeriod(seconds=3600)
 
-    result = external_files.is_file_recent(str(test_file), refresh)
+    result = external_files.is_file_recent(test_file, refresh)
 
     assert result is False
 
@@ -77,10 +79,12 @@ def test_is_file_recent_with_zero_refresh(setup_core: Path) -> None:
     test_file = setup_core / "test.txt"
     test_file.write_text("content")
 
-    # Mock getctime to return a time 10 seconds ago
+    # Mock stat to return a time 10 seconds ago
-    with patch("os.path.getctime", return_value=time.time() - 10):
+    mock_stat = MagicMock()
+    mock_stat.st_ctime = time.time() - 10
+    with patch.object(Path, "stat", return_value=mock_stat):
         refresh = TimePeriod(seconds=0)
-        result = external_files.is_file_recent(str(test_file), refresh)
+        result = external_files.is_file_recent(test_file, refresh)
         assert result is False
 
 
@@ -97,7 +101,7 @@ def test_has_remote_file_changed_not_modified(
     mock_head.return_value = mock_response
 
     url = "https://example.com/file.txt"
-    result = external_files.has_remote_file_changed(url, str(test_file))
+    result = external_files.has_remote_file_changed(url, test_file)
 
     assert result is False
     mock_head.assert_called_once()
@@ -121,7 +125,7 @@ def test_has_remote_file_changed_modified(
     mock_head.return_value = mock_response
 
     url = "https://example.com/file.txt"
-    result = external_files.has_remote_file_changed(url, str(test_file))
+    result = external_files.has_remote_file_changed(url, test_file)
 
     assert result is True
 
@@ -131,7 +135,7 @@ def test_has_remote_file_changed_no_local_file(setup_core: Path) -> None:
     test_file = setup_core / "nonexistent.txt"
 
     url = "https://example.com/file.txt"
-    result = external_files.has_remote_file_changed(url, str(test_file))
+    result = external_files.has_remote_file_changed(url, test_file)
 
     assert result is True
 
@@ -149,7 +153,7 @@ def test_has_remote_file_changed_network_error(
     url = "https://example.com/file.txt"
 
     with pytest.raises(Invalid, match="Could not check if.*Network error"):
-        external_files.has_remote_file_changed(url, str(test_file))
+        external_files.has_remote_file_changed(url, test_file)
 
 
 @patch("esphome.external_files.requests.head")
@@ -165,7 +169,7 @@ def test_has_remote_file_changed_timeout(
     mock_head.return_value = mock_response
 
     url = "https://example.com/file.txt"
-    external_files.has_remote_file_changed(url, str(test_file))
+    external_files.has_remote_file_changed(url, test_file)
 
     call_args = mock_head.call_args
     assert call_args[1]["timeout"] == external_files.NETWORK_TIMEOUT
@@ -191,6 +195,6 @@ def test_is_file_recent_handles_float_seconds(setup_core: Path) -> None:
 
     refresh = TimePeriod(seconds=3600.5)
 
-    result = external_files.is_file_recent(str(test_file), refresh)
+    result = external_files.is_file_recent(test_file, refresh)
 
     assert result is True

tests/unit_tests/test_helpers.py

@@ -154,11 +154,11 @@ def test_walk_files(fixture_path):
     actual = list(helpers.walk_files(path))
 
     # Ensure paths start with the root
-    assert all(p.startswith(str(path)) for p in actual)
+    assert all(p.is_relative_to(path) for p in actual)
 
 
 class Test_write_file_if_changed:
-    def test_src_and_dst_match(self, tmp_path):
+    def test_src_and_dst_match(self, tmp_path: Path):
         text = "A files are unique.\n"
         initial = text
         dst = tmp_path / "file-a.txt"
@@ -168,7 +168,7 @@ class Test_write_file_if_changed:
 
         assert dst.read_text() == text
 
-    def test_src_and_dst_do_not_match(self, tmp_path):
+    def test_src_and_dst_do_not_match(self, tmp_path: Path):
         text = "A files are unique.\n"
         initial = "B files are unique.\n"
         dst = tmp_path / "file-a.txt"
@@ -178,7 +178,7 @@ class Test_write_file_if_changed:
 
         assert dst.read_text() == text
 
-    def test_dst_does_not_exist(self, tmp_path):
+    def test_dst_does_not_exist(self, tmp_path: Path):
         text = "A files are unique.\n"
         dst = tmp_path / "file-a.txt"
 
@@ -188,7 +188,7 @@ class Test_write_file_if_changed:
 
 
 class Test_copy_file_if_changed:
-    def test_src_and_dst_match(self, tmp_path, fixture_path):
+    def test_src_and_dst_match(self, tmp_path: Path, fixture_path: Path):
         src = fixture_path / "helpers" / "file-a.txt"
         initial = fixture_path / "helpers" / "file-a.txt"
         dst = tmp_path / "file-a.txt"
@@ -197,7 +197,7 @@ class Test_copy_file_if_changed:
 
         helpers.copy_file_if_changed(src, dst)
 
-    def test_src_and_dst_do_not_match(self, tmp_path, fixture_path):
+    def test_src_and_dst_do_not_match(self, tmp_path: Path, fixture_path: Path):
         src = fixture_path / "helpers" / "file-a.txt"
         initial = fixture_path / "helpers" / "file-c.txt"
         dst = tmp_path / "file-a.txt"
@@ -208,7 +208,7 @@ class Test_copy_file_if_changed:
 
         assert src.read_text() == dst.read_text()
 
-    def test_dst_does_not_exist(self, tmp_path, fixture_path):
+    def test_dst_does_not_exist(self, tmp_path: Path, fixture_path: Path):
         src = fixture_path / "helpers" / "file-a.txt"
         dst = tmp_path / "file-a.txt"
 
@@ -604,9 +604,8 @@ def test_mkdir_p_with_existing_file_raises_error(tmp_path: Path) -> None:
         helpers.mkdir_p(dir_path)
 
 
-@pytest.mark.skipif(os.name == "nt", reason="Unix-specific test")
+def test_read_file(tmp_path: Path) -> None:
-def test_read_file_unix(tmp_path: Path) -> None:
+    """Test read_file reads file content correctly."""
-    """Test read_file reads file content correctly on Unix."""
     # Test reading regular file
     test_file = tmp_path / "test.txt"
     expected_content = "Test content\nLine 2\n"
@@ -624,31 +623,10 @@ def test_read_file_unix(tmp_path: Path) -> None:
     assert content == utf8_content
 
 
-@pytest.mark.skipif(os.name != "nt", reason="Windows-specific test")
-def test_read_file_windows(tmp_path: Path) -> None:
-    """Test read_file reads file content correctly on Windows."""
-    # Test reading regular file
-    test_file = tmp_path / "test.txt"
-    expected_content = "Test content\nLine 2\n"
-    test_file.write_text(expected_content)
-
-    content = helpers.read_file(test_file)
-    # On Windows, text mode reading converts \n to \r\n
-    assert content == expected_content.replace("\n", "\r\n")
-
-    # Test reading file with UTF-8 characters
-    utf8_file = tmp_path / "utf8.txt"
-    utf8_content = "Hello 世界 🌍"
-    utf8_file.write_text(utf8_content, encoding="utf-8")
-
-    content = helpers.read_file(utf8_file)
-    assert content == utf8_content
-
-
 def test_read_file_not_found() -> None:
     """Test read_file raises error for non-existent file."""
     with pytest.raises(EsphomeError, match=r"Error reading file"):
-        helpers.read_file("/nonexistent/file.txt")
+        helpers.read_file(Path("/nonexistent/file.txt"))
 
 
 def test_read_file_unicode_decode_error(tmp_path: Path) -> None:

tests/unit_tests/test_main.py

@@ -885,7 +885,7 @@ def test_upload_program_ota_success(
 
     assert exit_code == 0
     assert host == "192.168.1.100"
-    expected_firmware = str(
+    expected_firmware = (
         tmp_path / ".esphome" / "build" / "test" / ".pioenvs" / "test" / "firmware.bin"
     )
     mock_run_ota.assert_called_once_with(
@@ -919,7 +919,9 @@ def test_upload_program_ota_with_file_arg(
 
     assert exit_code == 0
     assert host == "192.168.1.100"
-    mock_run_ota.assert_called_once_with(["192.168.1.100"], 3232, "", "custom.bin")
+    mock_run_ota.assert_called_once_with(
+        ["192.168.1.100"], 3232, "", Path("custom.bin")
+    )
 
 
 def test_upload_program_ota_no_config(
@@ -972,7 +974,7 @@ def test_upload_program_ota_with_mqtt_resolution(
     assert exit_code == 0
     assert host == "192.168.1.100"
     mock_mqtt_get_ip.assert_called_once_with(config, "user", "pass", "client")
-    expected_firmware = str(
+    expected_firmware = (
         tmp_path / ".esphome" / "build" / "test" / ".pioenvs" / "test" / "firmware.bin"
     )
     mock_run_ota.assert_called_once_with(["192.168.1.100"], 3232, "", expected_firmware)
@@ -1382,7 +1384,7 @@ def test_command_wizard(tmp_path: Path) -> None:
         result = command_wizard(args)
 
         assert result == 0
-        mock_wizard.assert_called_once_with(str(config_file))
+        mock_wizard.assert_called_once_with(config_file)
 
 
 def test_command_rename_invalid_characters(
@@ -1407,7 +1409,7 @@ def test_command_rename_complex_yaml(
     config_file = tmp_path / "test.yaml"
     config_file.write_text("# Complex YAML without esphome section\nsome_key: value\n")
     setup_core(tmp_path=tmp_path)
-    CORE.config_path = str(config_file)
+    CORE.config_path = config_file
 
     args = MockArgs(name="newname")
     result = command_rename(args, {})
@@ -1436,7 +1438,7 @@ wifi:
   password: "test1234"
 """)
     setup_core(tmp_path=tmp_path)
-    CORE.config_path = str(config_file)
+    CORE.config_path = config_file
 
     # Set up CORE.config to avoid ValueError when accessing CORE.address
     CORE.config = {CONF_ESPHOME: {CONF_NAME: "oldname"}}
@@ -1486,7 +1488,7 @@ esp32:
   board: nodemcu-32s
 """)
     setup_core(tmp_path=tmp_path)
-    CORE.config_path = str(config_file)
+    CORE.config_path = config_file
 
     # Set up CORE.config to avoid ValueError when accessing CORE.address
     CORE.config = {
@@ -1523,7 +1525,7 @@ esp32:
   board: nodemcu-32s
 """)
     setup_core(tmp_path=tmp_path)
-    CORE.config_path = str(config_file)
+    CORE.config_path = config_file
 
     args = MockArgs(name="newname", dashboard=False)
 

tests/unit_tests/test_platformio_api.py

@@ -15,45 +15,45 @@ from esphome.core import CORE, EsphomeError
 
 def test_idedata_firmware_elf_path(setup_core: Path) -> None:
     """Test IDEData.firmware_elf_path returns correct path."""
-    CORE.build_path = str(setup_core / "build" / "test")
+    CORE.build_path = setup_core / "build" / "test"
     CORE.name = "test"
     raw_data = {"prog_path": "/path/to/firmware.elf"}
     idedata = platformio_api.IDEData(raw_data)
 
-    assert idedata.firmware_elf_path == "/path/to/firmware.elf"
+    assert idedata.firmware_elf_path == Path("/path/to/firmware.elf")
 
 
 def test_idedata_firmware_bin_path(setup_core: Path) -> None:
     """Test IDEData.firmware_bin_path returns Path with .bin extension."""
-    CORE.build_path = str(setup_core / "build" / "test")
+    CORE.build_path = setup_core / "build" / "test"
     CORE.name = "test"
     prog_path = str(Path("/path/to/firmware.elf"))
     raw_data = {"prog_path": prog_path}
     idedata = platformio_api.IDEData(raw_data)
 
     result = idedata.firmware_bin_path
-    assert isinstance(result, str)
+    assert isinstance(result, Path)
-    expected = str(Path("/path/to/firmware.bin"))
+    expected = Path("/path/to/firmware.bin")
     assert result == expected
-    assert result.endswith(".bin")
+    assert str(result).endswith(".bin")
 
 
 def test_idedata_firmware_bin_path_preserves_directory(setup_core: Path) -> None:
     """Test firmware_bin_path preserves the directory structure."""
-    CORE.build_path = str(setup_core / "build" / "test")
+    CORE.build_path = setup_core / "build" / "test"
     CORE.name = "test"
     prog_path = str(Path("/complex/path/to/build/firmware.elf"))
     raw_data = {"prog_path": prog_path}
     idedata = platformio_api.IDEData(raw_data)
 
     result = idedata.firmware_bin_path
-    expected = str(Path("/complex/path/to/build/firmware.bin"))
+    expected = Path("/complex/path/to/build/firmware.bin")
     assert result == expected
 
 
 def test_idedata_extra_flash_images(setup_core: Path) -> None:
     """Test IDEData.extra_flash_images returns list of FlashImage objects."""
-    CORE.build_path = str(setup_core / "build" / "test")
+    CORE.build_path = setup_core / "build" / "test"
     CORE.name = "test"
     raw_data = {
         "prog_path": "/path/to/firmware.elf",
@@ -69,15 +69,15 @@ def test_idedata_extra_flash_images(setup_core: Path) -> None:
     images = idedata.extra_flash_images
     assert len(images) == 2
     assert all(isinstance(img, platformio_api.FlashImage) for img in images)
-    assert images[0].path == "/path/to/bootloader.bin"
+    assert images[0].path == Path("/path/to/bootloader.bin")
     assert images[0].offset == "0x1000"
-    assert images[1].path == "/path/to/partition.bin"
+    assert images[1].path == Path("/path/to/partition.bin")
     assert images[1].offset == "0x8000"
 
 
 def test_idedata_extra_flash_images_empty(setup_core: Path) -> None:
     """Test extra_flash_images returns empty list when no extra images."""
-    CORE.build_path = str(setup_core / "build" / "test")
+    CORE.build_path = setup_core / "build" / "test"
     CORE.name = "test"
     raw_data = {"prog_path": "/path/to/firmware.elf", "extra": {"flash_images": []}}
     idedata = platformio_api.IDEData(raw_data)
@@ -88,7 +88,7 @@ def test_idedata_extra_flash_images_empty(setup_core: Path) -> None:
 
 def test_idedata_cc_path(setup_core: Path) -> None:
     """Test IDEData.cc_path returns compiler path."""
-    CORE.build_path = str(setup_core / "build" / "test")
+    CORE.build_path = setup_core / "build" / "test"
     CORE.name = "test"
     raw_data = {
         "prog_path": "/path/to/firmware.elf",
@@ -104,9 +104,9 @@ def test_idedata_cc_path(setup_core: Path) -> None:
 
 def test_flash_image_dataclass() -> None:
     """Test FlashImage dataclass stores path and offset correctly."""
-    image = platformio_api.FlashImage(path="/path/to/image.bin", offset="0x10000")
+    image = platformio_api.FlashImage(path=Path("/path/to/image.bin"), offset="0x10000")
 
-    assert image.path == "/path/to/image.bin"
+    assert image.path == Path("/path/to/image.bin")
     assert image.offset == "0x10000"
 
 
@@ -114,7 +114,7 @@ def test_load_idedata_returns_dict(
     setup_core: Path, mock_run_platformio_cli_run
 ) -> None:
     """Test _load_idedata returns parsed idedata dict when successful."""
-    CORE.build_path = str(setup_core / "build" / "test")
+    CORE.build_path = setup_core / "build" / "test"
     CORE.name = "test"
 
     # Create required files
@@ -366,7 +366,7 @@ def test_get_idedata_caches_result(
 
     assert result1 is result2
     assert isinstance(result1, platformio_api.IDEData)
-    assert result1.firmware_elf_path == "/test/firmware.elf"
+    assert result1.firmware_elf_path == Path("/test/firmware.elf")
 
 
 def test_idedata_addr2line_path_windows(setup_core: Path) -> None:
@@ -434,9 +434,9 @@ def test_patched_clean_build_dir_removes_outdated(setup_core: Path) -> None:
     os.utime(platformio_ini, (build_mtime + 1, build_mtime + 1))
 
     # Track if directory was removed
-    removed_paths: list[str] = []
+    removed_paths: list[Path] = []
 
-    def track_rmtree(path: str) -> None:
+    def track_rmtree(path: Path) -> None:
         removed_paths.append(path)
         shutil.rmtree(path)
 
@@ -466,7 +466,7 @@ def test_patched_clean_build_dir_removes_outdated(setup_core: Path) -> None:
 
         # Verify directory was removed and recreated
         assert len(removed_paths) == 1
-        assert removed_paths[0] == str(build_dir)
+        assert removed_paths[0] == build_dir
         assert build_dir.exists()  # makedirs recreated it
 
 

tests/unit_tests/test_storage_json.py

@@ -15,12 +15,12 @@ from esphome.core import CORE
 
 def test_storage_path(setup_core: Path) -> None:
     """Test storage_path returns correct path for current config."""
-    CORE.config_path = str(setup_core / "my_device.yaml")
+    CORE.config_path = setup_core / "my_device.yaml"
 
     result = storage_json.storage_path()
 
     data_dir = Path(CORE.data_dir)
-    expected = str(data_dir / "storage" / "my_device.yaml.json")
+    expected = data_dir / "storage" / "my_device.yaml.json"
     assert result == expected
 
 
@@ -29,20 +29,20 @@ def test_ext_storage_path(setup_core: Path) -> None:
     result = storage_json.ext_storage_path("other_device.yaml")
 
     data_dir = Path(CORE.data_dir)
-    expected = str(data_dir / "storage" / "other_device.yaml.json")
+    expected = data_dir / "storage" / "other_device.yaml.json"
     assert result == expected
 
 
 def test_ext_storage_path_handles_various_extensions(setup_core: Path) -> None:
     """Test ext_storage_path works with different file extensions."""
     result_yml = storage_json.ext_storage_path("device.yml")
-    assert result_yml.endswith("device.yml.json")
+    assert str(result_yml).endswith("device.yml.json")
 
     result_no_ext = storage_json.ext_storage_path("device")
-    assert result_no_ext.endswith("device.json")
+    assert str(result_no_ext).endswith("device.json")
 
     result_path = storage_json.ext_storage_path("my/device.yaml")
-    assert result_path.endswith("device.yaml.json")
+    assert str(result_path).endswith("device.yaml.json")
 
 
 def test_esphome_storage_path(setup_core: Path) -> None:
@@ -50,7 +50,7 @@ def test_esphome_storage_path(setup_core: Path) -> None:
     result = storage_json.esphome_storage_path()
 
     data_dir = Path(CORE.data_dir)
-    expected = str(data_dir / "esphome.json")
+    expected = data_dir / "esphome.json"
     assert result == expected
 
 
@@ -59,27 +59,27 @@ def test_ignored_devices_storage_path(setup_core: Path) -> None:
     result = storage_json.ignored_devices_storage_path()
 
     data_dir = Path(CORE.data_dir)
-    expected = str(data_dir / "ignored-devices.json")
+    expected = data_dir / "ignored-devices.json"
     assert result == expected
 
 
 def test_trash_storage_path(setup_core: Path) -> None:
     """Test trash_storage_path returns correct path."""
-    CORE.config_path = str(setup_core / "configs" / "device.yaml")
+    CORE.config_path = setup_core / "configs" / "device.yaml"
 
     result = storage_json.trash_storage_path()
 
-    expected = str(setup_core / "configs" / "trash")
+    expected = setup_core / "configs" / "trash"
     assert result == expected
 
 
 def test_archive_storage_path(setup_core: Path) -> None:
     """Test archive_storage_path returns correct path."""
-    CORE.config_path = str(setup_core / "configs" / "device.yaml")
+    CORE.config_path = setup_core / "configs" / "device.yaml"
 
     result = storage_json.archive_storage_path()
 
-    expected = str(setup_core / "configs" / "archive")
+    expected = setup_core / "configs" / "archive"
     assert result == expected
 
 
@@ -87,12 +87,12 @@ def test_storage_path_with_subdirectory(setup_core: Path) -> None:
     """Test storage paths work correctly when config is in subdirectory."""
     subdir = setup_core / "configs" / "basement"
     subdir.mkdir(parents=True, exist_ok=True)
-    CORE.config_path = str(subdir / "sensor.yaml")
+    CORE.config_path = subdir / "sensor.yaml"
 
     result = storage_json.storage_path()
 
     data_dir = Path(CORE.data_dir)
-    expected = str(data_dir / "storage" / "sensor.yaml.json")
+    expected = data_dir / "storage" / "sensor.yaml.json"
     assert result == expected
 
 
@@ -173,16 +173,16 @@ def test_storage_paths_with_ha_addon(mock_is_ha_addon: bool, tmp_path: Path) ->
     """Test storage paths when running as Home Assistant addon."""
     mock_is_ha_addon.return_value = True
 
-    CORE.config_path = str(tmp_path / "test.yaml")
+    CORE.config_path = tmp_path / "test.yaml"
 
     result = storage_json.storage_path()
     # When is_ha_addon is True, CORE.data_dir returns "/data"
     # This is the standard mount point for HA addon containers
-    expected = str(Path("/data") / "storage" / "test.yaml.json")
+    expected = Path("/data") / "storage" / "test.yaml.json"
     assert result == expected
 
     result = storage_json.esphome_storage_path()
-    expected = str(Path("/data") / "esphome.json")
+    expected = Path("/data") / "esphome.json"
     assert result == expected
 
 
@@ -375,7 +375,7 @@ def test_storage_json_load_valid_file(tmp_path: Path) -> None:
     file_path = tmp_path / "storage.json"
     file_path.write_text(json.dumps(storage_data))
 
-    result = storage_json.StorageJSON.load(str(file_path))
+    result = storage_json.StorageJSON.load(file_path)
 
     assert result is not None
     assert result.name == "loaded_device"
@@ -386,8 +386,8 @@ def test_storage_json_load_valid_file(tmp_path: Path) -> None:
     assert result.address == "10.0.0.1"
     assert result.web_port == 8080
     assert result.target_platform == "ESP32"
-    assert result.build_path == "/loaded/build"
+    assert result.build_path == Path("/loaded/build")
-    assert result.firmware_bin_path == "/loaded/firmware.bin"
+    assert result.firmware_bin_path == Path("/loaded/firmware.bin")
     assert result.loaded_integrations == {"wifi", "api"}
     assert result.loaded_platforms == {"sensor"}
     assert result.no_mdns is True
@@ -400,7 +400,7 @@ def test_storage_json_load_invalid_file(tmp_path: Path) -> None:
     file_path = tmp_path / "invalid.json"
     file_path.write_text("not valid json{")
 
-    result = storage_json.StorageJSON.load(str(file_path))
+    result = storage_json.StorageJSON.load(file_path)
 
     assert result is None
 
@@ -654,7 +654,7 @@ def test_storage_json_load_legacy_esphomeyaml_version(tmp_path: Path) -> None:
     file_path = tmp_path / "legacy.json"
     file_path.write_text(json.dumps(storage_data))
 
-    result = storage_json.StorageJSON.load(str(file_path))
+    result = storage_json.StorageJSON.load(file_path)
 
     assert result is not None
     assert result.esphome_version == "1.14.0"  # Should map to esphome_version

tests/unit_tests/test_substitutions.py

@@ -1,6 +1,6 @@
 import glob
 import logging
-import os
+from pathlib import Path
 
 from esphome import yaml_util
 from esphome.components import substitutions
@@ -52,9 +52,8 @@ def dict_diff(a, b, path=""):
     return diffs
 
 
-def write_yaml(path, data):
+def write_yaml(path: Path, data: dict) -> None:
-    with open(path, "w", encoding="utf-8") as f:
+    path.write_text(yaml_util.dump(data), encoding="utf-8")
-        f.write(yaml_util.dump(data))
 
 
 def test_substitutions_fixtures(fixture_path):
@@ -64,11 +63,10 @@ def test_substitutions_fixtures(fixture_path):
 
     failures = []
     for source_path in sources:
+        source_path = Path(source_path)
         try:
-            expected_path = source_path.replace(".input.yaml", ".approved.yaml")
+            expected_path = source_path.with_suffix("").with_suffix(".approved.yaml")
-            test_case = os.path.splitext(os.path.basename(source_path))[0].replace(
+            test_case = source_path.with_suffix("").stem
-                ".input", ""
-            )
 
             # Load using ESPHome's YAML loader
             config = yaml_util.load_yaml(source_path)
@@ -81,12 +79,12 @@ def test_substitutions_fixtures(fixture_path):
             substitutions.do_substitution_pass(config, None)
 
             # Also load expected using ESPHome's loader, or use {} if missing and DEV_MODE
-            if os.path.isfile(expected_path):
+            if expected_path.is_file():
                 expected = yaml_util.load_yaml(expected_path)
             elif DEV_MODE:
                 expected = {}
             else:
-                assert os.path.isfile(expected_path), (
+                assert expected_path.is_file(), (
                     f"Expected file missing: {expected_path}"
                 )
 
@@ -97,16 +95,14 @@ def test_substitutions_fixtures(fixture_path):
             if got_sorted != expected_sorted:
                 diff = "\n".join(dict_diff(got_sorted, expected_sorted))
                 msg = (
-                    f"Substitution result mismatch for {os.path.basename(source_path)}\n"
+                    f"Substitution result mismatch for {source_path.name}\n"
                     f"Diff:\n{diff}\n\n"
                     f"Got:      {got_sorted}\n"
                     f"Expected: {expected_sorted}"
                 )
                 # Write out the received file when test fails
                 if DEV_MODE:
-                    received_path = os.path.join(
+                    received_path = source_path.with_name(f"{test_case}.received.yaml")
-                        os.path.dirname(source_path), f"{test_case}.received.yaml"
-                    )
                     write_yaml(received_path, config)
                     print(msg)
                     failures.append(msg)

tests/unit_tests/test_util.py

@@ -32,21 +32,21 @@ def test_list_yaml_files_with_files_and_directories(tmp_path: Path) -> None:
 
     # Test with mixed input (directories and files)
     configs = [
-        str(dir1),
+        dir1,
-        str(standalone1),
+        standalone1,
-        str(dir2),
+        dir2,
-        str(standalone2),
+        standalone2,
     ]
 
     result = util.list_yaml_files(configs)
 
     # Should include all YAML files but not the .txt file
     assert set(result) == {
-        str(dir1 / "config1.yaml"),
+        dir1 / "config1.yaml",
-        str(dir1 / "config2.yml"),
+        dir1 / "config2.yml",
-        str(dir2 / "config3.yaml"),
+        dir2 / "config3.yaml",
-        str(standalone1),
+        standalone1,
-        str(standalone2),
+        standalone2,
     }
     # Check that results are sorted
     assert result == sorted(result)
@@ -63,12 +63,12 @@ def test_list_yaml_files_only_directories(tmp_path: Path) -> None:
     (dir1 / "b.yml").write_text("test: b")
     (dir2 / "c.yaml").write_text("test: c")
 
-    result = util.list_yaml_files([str(dir1), str(dir2)])
+    result = util.list_yaml_files([dir1, dir2])
 
     assert set(result) == {
-        str(dir1 / "a.yaml"),
+        dir1 / "a.yaml",
-        str(dir1 / "b.yml"),
+        dir1 / "b.yml",
-        str(dir2 / "c.yaml"),
+        dir2 / "c.yaml",
     }
     assert result == sorted(result)
 
@@ -88,17 +88,17 @@ def test_list_yaml_files_only_files(tmp_path: Path) -> None:
     # Include a non-YAML file to test filtering
     result = util.list_yaml_files(
         [
-            str(file1),
+            file1,
-            str(file2),
+            file2,
-            str(file3),
+            file3,
-            str(non_yaml),
+            non_yaml,
         ]
     )
 
     assert set(result) == {
-        str(file1),
+        file1,
-        str(file2),
+        file2,
-        str(file3),
+        file3,
     }
     assert result == sorted(result)
 
@@ -108,7 +108,7 @@ def test_list_yaml_files_empty_directory(tmp_path: Path) -> None:
     empty_dir = tmp_path / "empty"
     empty_dir.mkdir()
 
-    result = util.list_yaml_files([str(empty_dir)])
+    result = util.list_yaml_files([empty_dir])
 
     assert result == []
 
@@ -121,7 +121,7 @@ def test_list_yaml_files_nonexistent_path(tmp_path: Path) -> None:
 
     # Should raise an error for non-existent directory
     with pytest.raises(FileNotFoundError):
-        util.list_yaml_files([str(nonexistent), str(existing)])
+        util.list_yaml_files([nonexistent, existing])
 
 
 def test_list_yaml_files_mixed_extensions(tmp_path: Path) -> None:
@@ -137,11 +137,11 @@ def test_list_yaml_files_mixed_extensions(tmp_path: Path) -> None:
     yml_file.write_text("test: yml")
     other_file.write_text("test: txt")
 
-    result = util.list_yaml_files([str(dir1)])
+    result = util.list_yaml_files([dir1])
 
     assert set(result) == {
-        str(yaml_file),
+        yaml_file,
-        str(yml_file),
+        yml_file,
     }
 
 
@@ -174,17 +174,18 @@ def test_list_yaml_files_does_not_recurse_into_subdirectories(tmp_path: Path) ->
     assert len(result) == 3
 
     # Check that only root-level files are found
-    assert str(root / "config1.yaml") in result
+    assert root / "config1.yaml" in result
-    assert str(root / "config2.yml") in result
+    assert root / "config2.yml" in result
-    assert str(root / "device.yaml") in result
+    assert root / "device.yaml" in result
 
     # Ensure nested files are NOT found
     for r in result:
-        assert "subdir" not in r
+        r_str = str(r)
-        assert "deeper" not in r
+        assert "subdir" not in r_str
-        assert "nested1.yaml" not in r
+        assert "deeper" not in r_str
-        assert "nested2.yml" not in r
+        assert "nested1.yaml" not in r_str
-        assert "very_nested.yaml" not in r
+        assert "nested2.yml" not in r_str
+        assert "very_nested.yaml" not in r_str
 
 
 def test_list_yaml_files_excludes_secrets(tmp_path: Path) -> None:
@@ -202,10 +203,10 @@ def test_list_yaml_files_excludes_secrets(tmp_path: Path) -> None:
 
     # Should find 2 files (config.yaml and device.yaml), not secrets
     assert len(result) == 2
-    assert str(root / "config.yaml") in result
+    assert root / "config.yaml" in result
-    assert str(root / "device.yaml") in result
+    assert root / "device.yaml" in result
-    assert str(root / "secrets.yaml") not in result
+    assert root / "secrets.yaml" not in result
-    assert str(root / "secrets.yml") not in result
+    assert root / "secrets.yml" not in result
 
 
 def test_list_yaml_files_excludes_hidden_files(tmp_path: Path) -> None:
@@ -223,93 +224,102 @@ def test_list_yaml_files_excludes_hidden_files(tmp_path: Path) -> None:
 
     # Should find only non-hidden files
     assert len(result) == 2
-    assert str(root / "config.yaml") in result
+    assert root / "config.yaml" in result
-    assert str(root / "device.yaml") in result
+    assert root / "device.yaml" in result
-    assert str(root / ".hidden.yaml") not in result
+    assert root / ".hidden.yaml" not in result
-    assert str(root / ".backup.yml") not in result
+    assert root / ".backup.yml" not in result
 
 
 def test_filter_yaml_files_basic() -> None:
     """Test filter_yaml_files function."""
     files = [
-        "/path/to/config.yaml",
+        Path("/path/to/config.yaml"),
-        "/path/to/device.yml",
+        Path("/path/to/device.yml"),
-        "/path/to/readme.txt",
+        Path("/path/to/readme.txt"),
-        "/path/to/script.py",
+        Path("/path/to/script.py"),
-        "/path/to/data.json",
+        Path("/path/to/data.json"),
-        "/path/to/another.yaml",
+        Path("/path/to/another.yaml"),
     ]
 
     result = util.filter_yaml_files(files)
 
     assert len(result) == 3
-    assert "/path/to/config.yaml" in result
+    assert Path("/path/to/config.yaml") in result
-    assert "/path/to/device.yml" in result
+    assert Path("/path/to/device.yml") in result
-    assert "/path/to/another.yaml" in result
+    assert Path("/path/to/another.yaml") in result
-    assert "/path/to/readme.txt" not in result
+    assert Path("/path/to/readme.txt") not in result
-    assert "/path/to/script.py" not in result
+    assert Path("/path/to/script.py") not in result
-    assert "/path/to/data.json" not in result
+    assert Path("/path/to/data.json") not in result
 
 
 def test_filter_yaml_files_excludes_secrets() -> None:
     """Test that filter_yaml_files excludes secrets files."""
     files = [
-        "/path/to/config.yaml",
+        Path("/path/to/config.yaml"),
-        "/path/to/secrets.yaml",
+        Path("/path/to/secrets.yaml"),
-        "/path/to/secrets.yml",
+        Path("/path/to/secrets.yml"),
-        "/path/to/device.yaml",
+        Path("/path/to/device.yaml"),
-        "/some/dir/secrets.yaml",
+        Path("/some/dir/secrets.yaml"),
     ]
 
     result = util.filter_yaml_files(files)
 
     assert len(result) == 2
-    assert "/path/to/config.yaml" in result
+    assert Path("/path/to/config.yaml") in result
-    assert "/path/to/device.yaml" in result
+    assert Path("/path/to/device.yaml") in result
-    assert "/path/to/secrets.yaml" not in result
+    assert Path("/path/to/secrets.yaml") not in result
-    assert "/path/to/secrets.yml" not in result
+    assert Path("/path/to/secrets.yml") not in result
-    assert "/some/dir/secrets.yaml" not in result
+    assert Path("/some/dir/secrets.yaml") not in result
 
 
 def test_filter_yaml_files_excludes_hidden() -> None:
     """Test that filter_yaml_files excludes hidden files."""
     files = [
-        "/path/to/config.yaml",
+        Path("/path/to/config.yaml"),
-        "/path/to/.hidden.yaml",
+        Path("/path/to/.hidden.yaml"),
-        "/path/to/.backup.yml",
+        Path("/path/to/.backup.yml"),
-        "/path/to/device.yaml",
+        Path("/path/to/device.yaml"),
-        "/some/dir/.config.yaml",
+        Path("/some/dir/.config.yaml"),
     ]
 
     result = util.filter_yaml_files(files)
 
     assert len(result) == 2
-    assert "/path/to/config.yaml" in result
+    assert Path("/path/to/config.yaml") in result
-    assert "/path/to/device.yaml" in result
+    assert Path("/path/to/device.yaml") in result
-    assert "/path/to/.hidden.yaml" not in result
+    assert Path("/path/to/.hidden.yaml") not in result
-    assert "/path/to/.backup.yml" not in result
+    assert Path("/path/to/.backup.yml") not in result
-    assert "/some/dir/.config.yaml" not in result
+    assert Path("/some/dir/.config.yaml") not in result
 
 
 def test_filter_yaml_files_case_sensitive() -> None:
     """Test that filter_yaml_files is case-sensitive for extensions."""
     files = [
-        "/path/to/config.yaml",
+        Path("/path/to/config.yaml"),
-        "/path/to/config.YAML",
+        Path("/path/to/config.YAML"),
-        "/path/to/config.YML",
+        Path("/path/to/config.YML"),
-        "/path/to/config.Yaml",
+        Path("/path/to/config.Yaml"),
-        "/path/to/config.yml",
+        Path("/path/to/config.yml"),
     ]
 
     result = util.filter_yaml_files(files)
 
     # Should only match lowercase .yaml and .yml
     assert len(result) == 2
-    assert "/path/to/config.yaml" in result
+
-    assert "/path/to/config.yml" in result
+    # Check the actual suffixes to ensure case-sensitive filtering
-    assert "/path/to/config.YAML" not in result
+    result_suffixes = [p.suffix for p in result]
-    assert "/path/to/config.YML" not in result
+    assert ".yaml" in result_suffixes
-    assert "/path/to/config.Yaml" not in result
+    assert ".yml" in result_suffixes
+
+    # Verify the filtered files have the expected names
+    result_names = [p.name for p in result]
+    assert "config.yaml" in result_names
+    assert "config.yml" in result_names
+    # Ensure uppercase extensions are NOT included
+    assert "config.YAML" not in result_names
+    assert "config.YML" not in result_names
+    assert "config.Yaml" not in result_names
 
 
 @pytest.mark.parametrize(

tests/unit_tests/test_vscode.py

@@ -1,5 +1,5 @@
 import json
-import os
+from pathlib import Path
 from unittest.mock import Mock, patch
 
 from esphome import vscode
@@ -45,7 +45,7 @@ RESULT_NO_ERROR = '{"type": "result", "yaml_errors": [], "validation_errors": []
 
 
 def test_multi_file():
-    source_path = os.path.join("dir_path", "x.yaml")
+    source_path = str(Path("dir_path", "x.yaml"))
     output_lines = _run_repl_test(
         [
             _validate(source_path),
@@ -62,7 +62,7 @@ esp8266:
 
     expected_lines = [
         _read_file(source_path),
-        _read_file(os.path.join("dir_path", "secrets.yaml")),
+        _read_file(str(Path("dir_path", "secrets.yaml"))),
         RESULT_NO_ERROR,
     ]
 
@@ -70,7 +70,7 @@ esp8266:
 
 
 def test_shows_correct_range_error():
-    source_path = os.path.join("dir_path", "x.yaml")
+    source_path = str(Path("dir_path", "x.yaml"))
     output_lines = _run_repl_test(
         [
             _validate(source_path),
@@ -98,7 +98,7 @@ esp8266:
 
 
 def test_shows_correct_loaded_file_error():
-    source_path = os.path.join("dir_path", "x.yaml")
+    source_path = str(Path("dir_path", "x.yaml"))
     output_lines = _run_repl_test(
         [
             _validate(source_path),
@@ -121,7 +121,7 @@ packages:
     validation_error = error["validation_errors"][0]
     assert validation_error["message"].startswith("[broad] is an invalid option for")
     range = validation_error["range"]
-    assert range["document"] == os.path.join("dir_path", ".pkg.esp8266.yaml")
+    assert range["document"] == str(Path("dir_path", ".pkg.esp8266.yaml"))
     assert range["start_line"] == 1
     assert range["start_col"] == 2
     assert range["end_line"] == 1

tests/unit_tests/test_wizard.py

@@ -1,6 +1,5 @@
 """Tests for the wizard.py file."""
 
-import os
 from pathlib import Path
 from typing import Any
 from unittest.mock import MagicMock
@@ -127,7 +126,7 @@ def test_wizard_write_sets_platform(
     # Given
     del default_config["platform"]
     monkeypatch.setattr(wz, "write_file", MagicMock())
-    monkeypatch.setattr(CORE, "config_path", os.path.dirname(tmp_path))
+    monkeypatch.setattr(CORE, "config_path", tmp_path.parent)
 
     # When
     wz.wizard_write(tmp_path, **default_config)
@@ -147,7 +146,7 @@ def test_wizard_empty_config(tmp_path: Path, monkeypatch: MonkeyPatch):
         "name": "test-empty",
     }
     monkeypatch.setattr(wz, "write_file", MagicMock())
-    monkeypatch.setattr(CORE, "config_path", os.path.dirname(tmp_path))
+    monkeypatch.setattr(CORE, "config_path", tmp_path.parent)
 
     # When
     wz.wizard_write(tmp_path, **empty_config)
@@ -168,7 +167,7 @@ def test_wizard_upload_config(tmp_path: Path, monkeypatch: MonkeyPatch):
         "file_text": "# imported file 📁\n\n",
     }
     monkeypatch.setattr(wz, "write_file", MagicMock())
-    monkeypatch.setattr(CORE, "config_path", os.path.dirname(tmp_path))
+    monkeypatch.setattr(CORE, "config_path", tmp_path.parent)
 
     # When
     wz.wizard_write(tmp_path, **empty_config)
@@ -189,7 +188,7 @@ def test_wizard_write_defaults_platform_from_board_esp8266(
     default_config["board"] = [*ESP8266_BOARD_PINS][0]
 
     monkeypatch.setattr(wz, "write_file", MagicMock())
-    monkeypatch.setattr(CORE, "config_path", os.path.dirname(tmp_path))
+    monkeypatch.setattr(CORE, "config_path", tmp_path.parent)
 
     # When
     wz.wizard_write(tmp_path, **default_config)
@@ -210,7 +209,7 @@ def test_wizard_write_defaults_platform_from_board_esp32(
     default_config["board"] = [*ESP32_BOARD_PINS][0]
 
     monkeypatch.setattr(wz, "write_file", MagicMock())
-    monkeypatch.setattr(CORE, "config_path", os.path.dirname(tmp_path))
+    monkeypatch.setattr(CORE, "config_path", tmp_path.parent)
 
     # When
     wz.wizard_write(tmp_path, **default_config)
@@ -231,7 +230,7 @@ def test_wizard_write_defaults_platform_from_board_bk72xx(
     default_config["board"] = [*BK72XX_BOARD_PINS][0]
 
     monkeypatch.setattr(wz, "write_file", MagicMock())
-    monkeypatch.setattr(CORE, "config_path", os.path.dirname(tmp_path))
+    monkeypatch.setattr(CORE, "config_path", tmp_path.parent)
 
     # When
     wz.wizard_write(tmp_path, **default_config)
@@ -252,7 +251,7 @@ def test_wizard_write_defaults_platform_from_board_ln882x(
     default_config["board"] = [*LN882X_BOARD_PINS][0]
 
     monkeypatch.setattr(wz, "write_file", MagicMock())
-    monkeypatch.setattr(CORE, "config_path", os.path.dirname(tmp_path))
+    monkeypatch.setattr(CORE, "config_path", tmp_path.parent)
 
     # When
     wz.wizard_write(tmp_path, **default_config)
@@ -273,7 +272,7 @@ def test_wizard_write_defaults_platform_from_board_rtl87xx(
     default_config["board"] = [*RTL87XX_BOARD_PINS][0]
 
     monkeypatch.setattr(wz, "write_file", MagicMock())
-    monkeypatch.setattr(CORE, "config_path", os.path.dirname(tmp_path))
+    monkeypatch.setattr(CORE, "config_path", tmp_path.parent)
 
     # When
     wz.wizard_write(tmp_path, **default_config)
@@ -362,7 +361,7 @@ def test_wizard_rejects_path_with_invalid_extension():
     """
 
     # Given
-    config_file = "test.json"
+    config_file = Path("test.json")
 
     # When
     retval = wz.wizard(config_file)
@@ -371,31 +370,31 @@ def test_wizard_rejects_path_with_invalid_extension():
     assert retval == 1
 
 
-def test_wizard_rejects_existing_files(tmpdir):
+def test_wizard_rejects_existing_files(tmp_path):
     """
     The wizard should reject any configuration file that already exists
     """
 
     # Given
-    config_file = tmpdir.join("test.yaml")
+    config_file = tmp_path / "test.yaml"
-    config_file.write("")
+    config_file.write_text("")
 
     # When
-    retval = wz.wizard(str(config_file))
+    retval = wz.wizard(config_file)
 
     # Then
     assert retval == 2
 
 
 def test_wizard_accepts_default_answers_esp8266(
-    tmpdir, monkeypatch: MonkeyPatch, wizard_answers: list[str]
+    tmp_path: Path, monkeypatch: MonkeyPatch, wizard_answers: list[str]
 ):
     """
     The wizard should accept the given default answers for esp8266
     """
 
     # Given
-    config_file = tmpdir.join("test.yaml")
+    config_file = tmp_path / "test.yaml"
     input_mock = MagicMock(side_effect=wizard_answers)
     monkeypatch.setattr("builtins.input", input_mock)
     monkeypatch.setattr(wz, "safe_print", lambda t=None, end=None: 0)
@@ -403,14 +402,14 @@ def test_wizard_accepts_default_answers_esp8266(
     monkeypatch.setattr(wz, "wizard_write", MagicMock())
 
     # When
-    retval = wz.wizard(str(config_file))
+    retval = wz.wizard(config_file)
 
     # Then
     assert retval == 0
 
 
 def test_wizard_accepts_default_answers_esp32(
-    tmpdir, monkeypatch: MonkeyPatch, wizard_answers: list[str]
+    tmp_path: Path, monkeypatch: MonkeyPatch, wizard_answers: list[str]
 ):
     """
     The wizard should accept the given default answers for esp32
@@ -419,7 +418,7 @@ def test_wizard_accepts_default_answers_esp32(
     # Given
     wizard_answers[1] = "ESP32"
     wizard_answers[2] = "nodemcu-32s"
-    config_file = tmpdir.join("test.yaml")
+    config_file = tmp_path / "test.yaml"
     input_mock = MagicMock(side_effect=wizard_answers)
     monkeypatch.setattr("builtins.input", input_mock)
     monkeypatch.setattr(wz, "safe_print", lambda t=None, end=None: 0)
@@ -427,14 +426,14 @@ def test_wizard_accepts_default_answers_esp32(
     monkeypatch.setattr(wz, "wizard_write", MagicMock())
 
     # When
-    retval = wz.wizard(str(config_file))
+    retval = wz.wizard(config_file)
 
     # Then
     assert retval == 0
 
 
 def test_wizard_offers_better_node_name(
-    tmpdir, monkeypatch: MonkeyPatch, wizard_answers: list[str]
+    tmp_path: Path, monkeypatch: MonkeyPatch, wizard_answers: list[str]
 ):
     """
     When the node name does not conform, a better alternative is offered
@@ -451,7 +450,7 @@ def test_wizard_offers_better_node_name(
         wz, "default_input", MagicMock(side_effect=lambda _, default: default)
     )
 
-    config_file = tmpdir.join("test.yaml")
+    config_file = tmp_path / "test.yaml"
     input_mock = MagicMock(side_effect=wizard_answers)
     monkeypatch.setattr("builtins.input", input_mock)
     monkeypatch.setattr(wz, "safe_print", lambda t=None, end=None: 0)
@@ -459,7 +458,7 @@ def test_wizard_offers_better_node_name(
     monkeypatch.setattr(wz, "wizard_write", MagicMock())
 
     # When
-    retval = wz.wizard(str(config_file))
+    retval = wz.wizard(config_file)
 
     # Then
     assert retval == 0
@@ -467,7 +466,7 @@ def test_wizard_offers_better_node_name(
 
 
 def test_wizard_requires_correct_platform(
-    tmpdir, monkeypatch: MonkeyPatch, wizard_answers: list[str]
+    tmp_path: Path, monkeypatch: MonkeyPatch, wizard_answers: list[str]
 ):
     """
     When the platform is not either esp32 or esp8266, the wizard should reject it
@@ -476,7 +475,7 @@ def test_wizard_requires_correct_platform(
     # Given
     wizard_answers.insert(1, "foobar")  # add invalid entry for platform
 
-    config_file = tmpdir.join("test.yaml")
+    config_file = tmp_path / "test.yaml"
     input_mock = MagicMock(side_effect=wizard_answers)
     monkeypatch.setattr("builtins.input", input_mock)
     monkeypatch.setattr(wz, "safe_print", lambda t=None, end=None: 0)
@@ -484,14 +483,14 @@ def test_wizard_requires_correct_platform(
     monkeypatch.setattr(wz, "wizard_write", MagicMock())
 
     # When
-    retval = wz.wizard(str(config_file))
+    retval = wz.wizard(config_file)
 
     # Then
     assert retval == 0
 
 
 def test_wizard_requires_correct_board(
-    tmpdir, monkeypatch: MonkeyPatch, wizard_answers: list[str]
+    tmp_path: Path, monkeypatch: MonkeyPatch, wizard_answers: list[str]
 ):
     """
     When the board is not a valid esp8266 board, the wizard should reject it
@@ -500,7 +499,7 @@ def test_wizard_requires_correct_board(
     # Given
     wizard_answers.insert(2, "foobar")  # add an invalid entry for board
 
-    config_file = tmpdir.join("test.yaml")
+    config_file = tmp_path / "test.yaml"
     input_mock = MagicMock(side_effect=wizard_answers)
     monkeypatch.setattr("builtins.input", input_mock)
     monkeypatch.setattr(wz, "safe_print", lambda t=None, end=None: 0)
@@ -508,14 +507,14 @@ def test_wizard_requires_correct_board(
     monkeypatch.setattr(wz, "wizard_write", MagicMock())
 
     # When
-    retval = wz.wizard(str(config_file))
+    retval = wz.wizard(config_file)
 
     # Then
     assert retval == 0
 
 
 def test_wizard_requires_valid_ssid(
-    tmpdir, monkeypatch: MonkeyPatch, wizard_answers: list[str]
+    tmp_path: Path, monkeypatch: MonkeyPatch, wizard_answers: list[str]
 ):
     """
     When the board is not a valid esp8266 board, the wizard should reject it
@@ -524,7 +523,7 @@ def test_wizard_requires_valid_ssid(
     # Given
     wizard_answers.insert(3, "")  # add an invalid entry for ssid
 
-    config_file = tmpdir.join("test.yaml")
+    config_file = tmp_path / "test.yaml"
     input_mock = MagicMock(side_effect=wizard_answers)
     monkeypatch.setattr("builtins.input", input_mock)
     monkeypatch.setattr(wz, "safe_print", lambda t=None, end=None: 0)
@@ -532,28 +531,28 @@ def test_wizard_requires_valid_ssid(
     monkeypatch.setattr(wz, "wizard_write", MagicMock())
 
     # When
-    retval = wz.wizard(str(config_file))
+    retval = wz.wizard(config_file)
 
     # Then
     assert retval == 0
 
 
 def test_wizard_write_protects_existing_config(
-    tmpdir, default_config: dict[str, Any], monkeypatch: MonkeyPatch
+    tmp_path: Path, default_config: dict[str, Any], monkeypatch: MonkeyPatch
 ):
     """
     The wizard_write function should not overwrite existing config files and return False
     """
     # Given
-    config_file = tmpdir.join("test.yaml")
+    config_file = tmp_path / "test.yaml"
     original_content = "# Original config content\n"
-    config_file.write(original_content)
+    config_file.write_text(original_content)
 
-    monkeypatch.setattr(CORE, "config_path", str(tmpdir))
+    monkeypatch.setattr(CORE, "config_path", tmp_path.parent)
 
     # When
-    result = wz.wizard_write(str(config_file), **default_config)
+    result = wz.wizard_write(config_file, **default_config)
 
     # Then
     assert result is False  # Should return False when file exists
-    assert config_file.read() == original_content
+    assert config_file.read_text() == original_content

tests/unit_tests/test_writer.py

@@ -257,10 +257,7 @@ def test_clean_cmake_cache(
     cmake_cache_file.write_text("# CMake cache file")
 
     # Setup mocks
-    mock_core.relative_pioenvs_path.side_effect = [
+    mock_core.relative_pioenvs_path.return_value = pioenvs_dir
-        str(pioenvs_dir),  # First call for directory check
-        str(cmake_cache_file),  # Second call for file path
-    ]
     mock_core.name = "test_device"
 
     # Verify file exists before
@@ -288,7 +285,7 @@ def test_clean_cmake_cache_no_pioenvs_dir(
     pioenvs_dir = tmp_path / ".pioenvs"
 
     # Setup mocks
-    mock_core.relative_pioenvs_path.return_value = str(pioenvs_dir)
+    mock_core.relative_pioenvs_path.return_value = pioenvs_dir
 
     # Verify directory doesn't exist
     assert not pioenvs_dir.exists()
@@ -314,10 +311,7 @@ def test_clean_cmake_cache_no_cmake_file(
     cmake_cache_file = device_dir / "CMakeCache.txt"
 
     # Setup mocks
-    mock_core.relative_pioenvs_path.side_effect = [
+    mock_core.relative_pioenvs_path.return_value = pioenvs_dir
-        str(pioenvs_dir),  # First call for directory check
-        str(cmake_cache_file),  # Second call for file path
-    ]
     mock_core.name = "test_device"
 
     # Verify file doesn't exist
@@ -358,9 +352,9 @@ def test_clean_build(
     (platformio_cache_dir / "downloads" / "package.tar.gz").write_text("package")
 
     # Setup mocks
-    mock_core.relative_pioenvs_path.return_value = str(pioenvs_dir)
+    mock_core.relative_pioenvs_path.return_value = pioenvs_dir
-    mock_core.relative_piolibdeps_path.return_value = str(piolibdeps_dir)
+    mock_core.relative_piolibdeps_path.return_value = piolibdeps_dir
-    mock_core.relative_build_path.return_value = str(dependencies_lock)
+    mock_core.relative_build_path.return_value = dependencies_lock
 
     # Verify all exist before
     assert pioenvs_dir.exists()
@@ -408,9 +402,9 @@ def test_clean_build_partial_exists(
     dependencies_lock = tmp_path / "dependencies.lock"
 
     # Setup mocks
-    mock_core.relative_pioenvs_path.return_value = str(pioenvs_dir)
+    mock_core.relative_pioenvs_path.return_value = pioenvs_dir
-    mock_core.relative_piolibdeps_path.return_value = str(piolibdeps_dir)
+    mock_core.relative_piolibdeps_path.return_value = piolibdeps_dir
-    mock_core.relative_build_path.return_value = str(dependencies_lock)
+    mock_core.relative_build_path.return_value = dependencies_lock
 
     # Verify only pioenvs exists
     assert pioenvs_dir.exists()
@@ -445,9 +439,9 @@ def test_clean_build_nothing_exists(
     dependencies_lock = tmp_path / "dependencies.lock"
 
     # Setup mocks
-    mock_core.relative_pioenvs_path.return_value = str(pioenvs_dir)
+    mock_core.relative_pioenvs_path.return_value = pioenvs_dir
-    mock_core.relative_piolibdeps_path.return_value = str(piolibdeps_dir)
+    mock_core.relative_piolibdeps_path.return_value = piolibdeps_dir
-    mock_core.relative_build_path.return_value = str(dependencies_lock)
+    mock_core.relative_build_path.return_value = dependencies_lock
 
     # Verify nothing exists
     assert not pioenvs_dir.exists()
@@ -481,9 +475,9 @@ def test_clean_build_platformio_not_available(
     dependencies_lock.write_text("lock file")
 
     # Setup mocks
-    mock_core.relative_pioenvs_path.return_value = str(pioenvs_dir)
+    mock_core.relative_pioenvs_path.return_value = pioenvs_dir
-    mock_core.relative_piolibdeps_path.return_value = str(piolibdeps_dir)
+    mock_core.relative_piolibdeps_path.return_value = piolibdeps_dir
-    mock_core.relative_build_path.return_value = str(dependencies_lock)
+    mock_core.relative_build_path.return_value = dependencies_lock
 
     # Verify all exist before
     assert pioenvs_dir.exists()
@@ -519,9 +513,9 @@ def test_clean_build_empty_cache_dir(
     pioenvs_dir.mkdir()
 
     # Setup mocks
-    mock_core.relative_pioenvs_path.return_value = str(pioenvs_dir)
+    mock_core.relative_pioenvs_path.return_value = pioenvs_dir
-    mock_core.relative_piolibdeps_path.return_value = str(tmp_path / ".piolibdeps")
+    mock_core.relative_piolibdeps_path.return_value = tmp_path / ".piolibdeps"
-    mock_core.relative_build_path.return_value = str(tmp_path / "dependencies.lock")
+    mock_core.relative_build_path.return_value = tmp_path / "dependencies.lock"
 
     # Verify pioenvs exists before
     assert pioenvs_dir.exists()
@@ -552,7 +546,7 @@ def test_write_gitignore_creates_new_file(
     gitignore_path = tmp_path / ".gitignore"
 
     # Setup mocks
-    mock_core.relative_config_path.return_value = str(gitignore_path)
+    mock_core.relative_config_path.return_value = gitignore_path
 
     # Verify file doesn't exist
     assert not gitignore_path.exists()
@@ -576,7 +570,7 @@ def test_write_gitignore_skips_existing_file(
     gitignore_path.write_text(existing_content)
 
     # Setup mocks
-    mock_core.relative_config_path.return_value = str(gitignore_path)
+    mock_core.relative_config_path.return_value = gitignore_path
 
     # Verify file exists with custom content
     assert gitignore_path.exists()
@@ -615,7 +609,7 @@ void loop() {{}}"""
     main_cpp.write_text(existing_content)
 
     # Setup mocks
-    mock_core.relative_src_path.return_value = str(main_cpp)
+    mock_core.relative_src_path.return_value = main_cpp
     mock_core.cpp_global_section = "// Global section"
 
     # Call the function
@@ -652,7 +646,7 @@ def test_write_cpp_creates_new_file(
     main_cpp = tmp_path / "main.cpp"
 
     # Setup mocks
-    mock_core.relative_src_path.return_value = str(main_cpp)
+    mock_core.relative_src_path.return_value = main_cpp
     mock_core.cpp_global_section = "// Global section"
 
     # Verify file doesn't exist
@@ -668,7 +662,7 @@ def test_write_cpp_creates_new_file(
     # Get the content that would be written
     mock_write_file.assert_called_once()
     written_path, written_content = mock_write_file.call_args[0]
-    assert written_path == str(main_cpp)
+    assert written_path == main_cpp
 
     # Check that all necessary parts are in the new file
     assert '#include "esphome.h"' in written_content
@@ -698,7 +692,7 @@ def test_write_cpp_with_missing_end_marker(
     main_cpp.write_text(existing_content)
 
     # Setup mocks
-    mock_core.relative_src_path.return_value = str(main_cpp)
+    mock_core.relative_src_path.return_value = main_cpp
 
     # Call should raise an error
     with pytest.raises(EsphomeError, match="Could not find auto generated code end"):
@@ -724,7 +718,7 @@ def test_write_cpp_with_duplicate_markers(
     main_cpp.write_text(existing_content)
 
     # Setup mocks
-    mock_core.relative_src_path.return_value = str(main_cpp)
+    mock_core.relative_src_path.return_value = main_cpp
 
     # Call should raise an error
     with pytest.raises(EsphomeError, match="Found multiple auto generate code begins"):

tests/unit_tests/test_yaml_util.py

@@ -67,18 +67,18 @@ def test_parsing_with_custom_loader(fixture_path):
     """
     yaml_file = fixture_path / "yaml_util" / "includetest.yaml"
 
-    loader_calls = []
+    loader_calls: list[Path] = []
 
-    def custom_loader(fname):
+    def custom_loader(fname: Path):
         loader_calls.append(fname)
 
-    with open(yaml_file, encoding="utf-8") as f_handle:
+    with yaml_file.open(encoding="utf-8") as f_handle:
         yaml_util.parse_yaml(yaml_file, f_handle, custom_loader)
 
     assert len(loader_calls) == 3
-    assert loader_calls[0].endswith("includes/included.yaml")
+    assert loader_calls[0].parts[-2:] == ("includes", "included.yaml")
-    assert loader_calls[1].endswith("includes/list.yaml")
+    assert loader_calls[1].parts[-2:] == ("includes", "list.yaml")
-    assert loader_calls[2].endswith("includes/scalar.yaml")
+    assert loader_calls[2].parts[-2:] == ("includes", "scalar.yaml")
 
 
 def test_construct_secret_simple(fixture_path: Path) -> None:
@@ -110,7 +110,7 @@ wifi:
     secrets_yaml.write_text("some_other_secret: value")
 
     with pytest.raises(EsphomeError, match="Secret 'nonexistent_secret' not defined"):
-        yaml_util.load_yaml(str(test_yaml))
+        yaml_util.load_yaml(test_yaml)
 
 
 def test_construct_secret_no_secrets_file(tmp_path: Path) -> None:
@@ -124,10 +124,10 @@ wifi:
 
     # Mock CORE.config_path to avoid NoneType error
     with (
-        patch.object(core.CORE, "config_path", str(tmp_path / "main.yaml")),
+        patch.object(core.CORE, "config_path", tmp_path / "main.yaml"),
         pytest.raises(EsphomeError, match="secrets.yaml"),
     ):
-        yaml_util.load_yaml(str(test_yaml))
+        yaml_util.load_yaml(test_yaml)
 
 
 def test_construct_secret_fallback_to_main_config_dir(
@@ -149,8 +149,8 @@ wifi:
     main_secrets.write_text("test_secret: main_secret_value")
 
     # Mock CORE.config_path to point to main directory
-    with patch.object(core.CORE, "config_path", str(tmp_path / "main.yaml")):
+    with patch.object(core.CORE, "config_path", tmp_path / "main.yaml"):
-        actual = yaml_util.load_yaml(str(test_yaml))
+        actual = yaml_util.load_yaml(test_yaml)
         assert actual["wifi"]["password"] == "main_secret_value"
 
 
@@ -167,7 +167,7 @@ def test_construct_include_dir_named(fixture_path: Path, tmp_path: Path) -> None
 sensor: !include_dir_named named_dir
 """)
 
-    actual = yaml_util.load_yaml(str(test_yaml))
+    actual = yaml_util.load_yaml(test_yaml)
     actual_sensor = actual["sensor"]
 
     # Check that files were loaded with their names as keys
@@ -202,7 +202,7 @@ def test_construct_include_dir_named_empty_dir(tmp_path: Path) -> None:
 sensor: !include_dir_named empty_dir
 """)
 
-    actual = yaml_util.load_yaml(str(test_yaml))
+    actual = yaml_util.load_yaml(test_yaml)
 
     # Should return empty OrderedDict
     assert isinstance(actual["sensor"], OrderedDict)
@@ -234,7 +234,7 @@ def test_construct_include_dir_named_with_dots(tmp_path: Path) -> None:
 test: !include_dir_named test_dir
 """)
 
-    actual = yaml_util.load_yaml(str(test_yaml))
+    actual = yaml_util.load_yaml(test_yaml)
 
     # Should only include visible file
     assert "visible" in actual["test"]
@@ -258,7 +258,7 @@ def test_find_files_recursive(fixture_path: Path, tmp_path: Path) -> None:
 all_sensors: !include_dir_named named_dir
 """)
 
-    actual = yaml_util.load_yaml(str(test_yaml))
+    actual = yaml_util.load_yaml(test_yaml)
 
     # Should find sensor1.yaml, sensor2.yaml, and subdir/sensor3.yaml (all flattened)
     assert len(actual["all_sensors"]) == 3