Drop Python 2 Support (#793)

* Remove Python 2 support

* Remove u-strings

* Remove docker symlinks

* Remove from travis

* Update requirements

* Upgrade flake8/pylint

* Fixes

* Manual

* Run pyupgrade

* Lint

* Remove base_int

* Fix

* Update platformio_api.py

* Update component.cpp

esphome/platformio_api.py

@@ -1,5 +1,3 @@
-from __future__ import print_function
-
 import json
 import logging
 import os
@@ -7,7 +5,6 @@ import re
 import subprocess
 
 from esphome.core import CORE
-from esphome.py_compat import decode_text
 from esphome.util import run_external_command, run_external_process
 
 _LOGGER = logging.getLogger(__name__)
@@ -61,6 +58,7 @@ FILTER_PLATFORMIO_LINES = [
     r'Installing dependencies',
     r'.* @ .* is already installed',
     r'Building in .* mode',
+    r'Advanced Memory Usage is available via .*',
 ]
 
 
@@ -100,8 +98,7 @@ def run_upload(config, verbose, port):
 
 def run_idedata(config):
     args = ['-t', 'idedata']
-    stdout = run_platformio_cli_run(config, False, *args, capture_stdout=True)
-    stdout = decode_text(stdout)
+    stdout = run_platformio_cli_run(config, False, *args, capture_stdout=True).decode()
     match = re.search(r'{\s*".*}', stdout)
     if match is None:
         _LOGGER.debug("Could not match IDEData for %s", stdout)
@@ -172,7 +169,7 @@ def _decode_pc(config, addr):
         return
     command = [idedata.addr2line_path, '-pfiaC', '-e', idedata.firmware_elf_path, addr]
     try:
-        translation = decode_text(subprocess.check_output(command)).strip()
+        translation = subprocess.check_output(command).decode().strip()
     except Exception:  # pylint: disable=broad-except
         _LOGGER.debug("Caught exception for command %s", command, exc_info=1)
         return
@@ -246,7 +243,7 @@ def process_stacktrace(config, line, backtrace_state):
     return backtrace_state
 
 
-class IDEData(object):
+class IDEData:
     def __init__(self, raw):
         if not isinstance(raw, dict):
             self.raw = {}