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MNT: Deprecate other capitalization than "None" in matplotlibrc #29529

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Merged
merged 1 commit into from
Jan 28, 2025
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MNT: Deprecate other capitalization than "None" in matplotlibrc #29529

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7 changes: 7 additions & 0 deletions doc/api/next_api_changes/deprecations/ 29529-TH.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,7 @@
Capitalization of None in matplotlibrc
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

In :file:`matplotlibrc` config files every capitalization of None was
accepted for denoting the Python constant `None`. This is deprecated. The
only accepted capitalization is now None, i.e. starting with a capital letter
and all other letters in lowercase.
8 changes: 8 additions & 0 deletions lib/matplotlib/rcsetup.py
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Original file line number Diff line number Diff line change
Expand Up @@ -191,6 +191,14 @@
def validator(s):
if (allow_none and
(s is None or cbook._str_lower_equal(s, "none"))):
if cbook._str_lower_equal(s, "none") and s != "None":
_api.warn_deprecated(

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lib/matplotlib/rcsetup.py#L195 

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"3.11",
message=f"Using the capitalization {s!r} in matplotlibrc for "
"*None* is deprecated in %(removal)s and will lead to an "
"error from version 3.13 onward. Please use 'None' "
"instead."
)
return None
if cls is str and not isinstance(s, str):
raise ValueError(f'Could not convert {s!r} to str')
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