Use functools.cache instead of lru_cache to establish singletons.

The intent is clearer (and cache is slightly more optimized).

Author: anntzer

lib/matplotlib/_fontconfig_pattern.py

@@ -9,7 +9,7 @@
 # there would have created cyclical dependency problems, because it also needs
 # to be available from `matplotlib.rcsetup` (for parsing matplotlibrc files).
 
-from functools import lru_cache, partial
+from functools import cache, lru_cache, partial
 import re
 
 from pyparsing import (
@@ -52,7 +52,7 @@
 }
 
 
-@lru_cache  # The parser instance is a singleton.
+@cache  # The parser instance is a singleton.
 def _make_fontconfig_parser():
     def comma_separated(elem):
         return elem + ZeroOrMore(Suppress(",") + elem)

lib/matplotlib/dviread.py

@@ -19,7 +19,7 @@
 
 from collections import namedtuple
 import enum
-from functools import lru_cache, partial, wraps
+from functools import cache, lru_cache, partial, wraps
 import logging
 import os
 from pathlib import Path
@@ -1020,7 +1020,7 @@ def _parse_enc(path):
 
 
 class _LuatexKpsewhich:
-    @lru_cache  # A singleton.
+    @cache  # A singleton.
     def __new__(cls):
         self = object.__new__(cls)
         self._proc = self._new_proc()

lib/matplotlib/font_manager.py

@@ -30,7 +30,7 @@
 from base64 import b64encode
 import copy
 import dataclasses
-from functools import lru_cache
+from functools import cache, lru_cache
 import functools
 from io import BytesIO
 import json
@@ -247,7 +247,7 @@ def _get_win32_installed_fonts():
     return items
 
 
-@lru_cache
+@cache
 def _get_fontconfig_fonts():
     """Cache and list the font paths known to ``fc-list``."""
     try:
@@ -261,7 +261,7 @@ def _get_fontconfig_fonts():
     return [Path(os.fsdecode(fname)) for fname in out.split(b'\n')]
 
 
-@lru_cache
+@cache
 def _get_macos_fonts():
     """Cache and list the font paths known to ``system_profiler SPFontsDataType``."""
     try: