Merge pull request #2912 from HalfWhitt/remove-lru-cache

Replacing lru_cache with cache, post-3.8

changes/2912.misc.rst

@@ -0,0 +1 @@
+Use of functools.lru_cache has been replaced with functools.cache, now that Python 3.8 is no longer supported.

core/src/toga/images.py

@@ -4,7 +4,7 @@
 import os
 import sys
 import warnings
-from functools import lru_cache
+from functools import cache
 from pathlib import Path
 from typing import TYPE_CHECKING, Any, Protocol, TypeVar
 from warnings import warn
@@ -155,7 +155,7 @@ def __init__(
             raise TypeError("Unsupported source type for Image")
 
     @classmethod
-    @lru_cache(maxsize=None)
+    @cache
     def _converters(cls) -> list[ImageConverter]:
         """Return list of registered image plugin converters. Only loaded once."""
         converters = []

core/src/toga/platform.py

@@ -3,7 +3,7 @@
 import importlib
 import os
 import sys
-from functools import lru_cache
+from functools import cache
 from types import ModuleType
 
 if sys.version_info >= (3, 10):  # pragma: no-cover-if-lt-py310
@@ -51,7 +51,7 @@ def find_backends():
     return sorted(set(entry_points(group="toga.backends")))
 
 
-@lru_cache(maxsize=1)
+@cache
 def get_platform_factory() -> ModuleType:
     """Determine the current host platform and import the platform factory.