Don't compile unnecessary platform files (e.g. ESP8266 files on ESP32) (#9354)

esphome/enum.py

@@ -0,0 +1,20 @@
+"""Enum backports from standard lib."""
+
+from __future__ import annotations
+
+from enum import Enum
+from typing import Any
+
+
+class StrEnum(str, Enum):
+    """Partial backport of Python 3.11's StrEnum for our basic use cases."""
+
+    def __new__(cls, value: str, *args: Any, **kwargs: Any) -> StrEnum:
+        """Create a new StrEnum instance."""
+        if not isinstance(value, str):
+            raise TypeError(f"{value!r} is not a string")
+        return super().__new__(cls, value, *args, **kwargs)
+
+    def __str__(self) -> str:
+        """Return self.value."""
+        return str(self.value)