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Commit93e01c8

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rcomertimhoffm
authored andcommitted
MNT: Deprecate other capitalization than "None" in matplotlibrc
The `*_or_None` validators have accepted any capitalization of thestring "none" as input. This is overly permissive andwill likely lead to conflicts in the future because we cannotdistinguish between resolving to `None` and `"none"` which may be needfor some parameters in the future.Inspired by#29481.
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Capitalization of None in matplotlibrc
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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In:file:`matplotlibrc` config files every capitalization of None was
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accepted for denoting the Python constant `None`. This is deprecated. The
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only accepted capitalization is now None, i.e. starting with a capital letter
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and all other letters in lowercase.

‎lib/matplotlib/rcsetup.py

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@@ -191,6 +191,13 @@ def _make_type_validator(cls, *, allow_none=False):
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defvalidator(s):
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if (allow_noneand
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(sisNoneorcbook._str_lower_equal(s,"none"))):
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ifcbook._str_lower_equal(s,"none")ands!="None":
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_api.warn_deprecated(
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"3.11",
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message=f"Using the capitalization{s!r} in matplotlibrc for "
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"*None* is deprecated in %(removal)s and will leaa to "
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"an error two versions later. Please use 'None' instead."
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)
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returnNone
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ifclsisstrandnotisinstance(s,str):
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raiseValueError(f'Could not convert{s!r} to str')

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