MNT: Deprecate cbook.maxdict

greglucas · anntzer · commit 44d21ac4b9f1 · 2022-01-26T16:55:11.000+01:00
It was used in one place in the library and there is now
a standard library lru_cache that we can take advantage of instead.
diff --git a/doc/api/next_api_changes/deprecations/22323-GL.rst b/doc/api/next_api_changes/deprecations/22323-GL.rst
@@ -0,0 +1,4 @@
+``matplotlib.cbook.maxdict`` is deprecated
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+This class has been deprecated in favor of the standard library
+``functools.lru_cache``.
diff --git a/lib/matplotlib/cbook/__init__.py b/lib/matplotlib/cbook/__init__.py
@@ -540,6 +540,7 @@ def flatten(seq, scalarp=is_scalar_or_string):
             yield from flatten(item, scalarp)
 
 
+@_api.deprecated("3.6", alternative="functools.lru_cache")
 class maxdict(dict):
     """
     A dictionary with a maximum size.
