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gh-131146: Fall back to month_name if standalone_month_names aren't distinct #137674

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Merged
merged 2 commits into from
Aug 13, 2025
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gh-131146: Fall back to month_name if standalone_month_names aren't distinct #137674

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gh-131146: Fall back to `month_name` if `standalone_month_name`s aren…
encukou Aug 12, 2025
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encukou Aug 13, 2025
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8 changes: 8 additions & 0 deletions Lib/calendar.py
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Original file line number Diff line number Diff line change
Expand Up @@ -149,6 +149,14 @@ def __len__(self):
except ValueError:
standalone_month_name = month_name
standalone_month_abbr = month_abbr
else:
# Some systems that do not support '%OB' will keep it as-is (i.e.,
# we get [..., '%OB', '%OB', '%OB']), so if for non-distinct names,
# we fall back to month_name/month_abbr.
if len(set(standalone_month_name)) != len(set(month_name)):
standalone_month_name = month_name
if len(set(standalone_month_abbr)) != len(set(month_abbr)):
standalone_month_abbr = month_abbr


def isleap(year):
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