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Merged
merged 13 commits into from
Aug 20, 2025
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Merged

gh-137481: consider actual day name length #137482

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675377b
Fix #137481
snoyes Aug 6, 2025
fab014e
added test
snoyes Aug 6, 2025
3166281
Merge branch 'python:main' into patch-4
snoyes Aug 6, 2025
29a18cc
news for calendar abbrev width
snoyes Aug 6, 2025
71fc1c2
Merge branch 'main' into patch-4
snoyes Aug 6, 2025
62b065c
test all locales
snoyes Aug 7, 2025
bb9a8b1
Merge branch 'patch-4' of https://github.com/snoyes/cpython into patch-4
snoyes Aug 7, 2025
c796689
provide a few locales to test
snoyes Aug 8, 2025
95cabcd
test for proper abbreviation of long names
snoyes Aug 8, 2025
a5d46d0
remove sinhala, abbreviation is not 4 characters
snoyes Aug 8, 2025
51e1220
shorter lines, removed lambda
snoyes Aug 8, 2025
79e0134
test all provided locales
snoyes Aug 8, 2025
b86dffb
remove trailing whitespace
snoyes Aug 8, 2025
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2 changes: 1 addition & 1 deletion Lib/calendar.py
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Original file line number Diff line number Diff line change
Expand Up @@ -370,7 +370,7 @@ def formatweekday(self, day, width):
"""
Returns a formatted week day name.
"""
if width >= 9:
if width >= max(map(len, day_name)):
names = day_name
else:
names = day_abbr
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46 changes: 46 additions & 0 deletions Lib/test/test_calendar.py
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Expand Up @@ -696,6 +696,52 @@ def test_locale_calendar_formatweekday(self):
except locale.Error:
raise unittest.SkipTest('cannot set the en_US locale')

# These locales have weekday names all shorter than English's longest
# 'Wednesday'. They should not be abbreviated unnecessarily
@support.run_with_locales("LC_ALL",
'Chinese', 'zh_CN.UTF-8',
'French', 'fr_FR.UTF-8',
'Norwegian', 'nb_NO.UTF-8',
'Malay', 'ms_MY.UTF8'
)
def test_locale_calendar_short_weekday_names(self):
names = (datetime.date(2001, 1, i+1).strftime('%A') for i in range(7))
max_length = max(map(len, names))
if max_length >= 9:
self.skipTest('weekday names are too long')

def get_weekday_names(width):
return calendar.TextCalendar().formatweekheader(width).split()

# Weekday names should not be abbreviated if the width is sufficient
self.assertEqual(
get_weekday_names(max_length),
get_weekday_names(max_length + 10)
)

# Any width shorter than necessary should produce abbreviations
self.assertNotEqual(
get_weekday_names(max_length),
get_weekday_names(max_length - 1)
)

# These locales have a weekday name longer than 'Wednesday'
# They should be properly abbreviated rather than truncated
@support.run_with_locales("LC_ALL",
'Portuguese', 'pt_PT.UTF-8',
'German', 'de_DE.UTF-8',
'Russian', 'ru_RU.UTF-8',
)
def test_locale_calendar_long_weekday_names(self):
names = (datetime.date(2001, 1, i+1).strftime('%A') for i in range(7))
max_length = max(map(len, names))
if max_length <= 9:
self.skipTest('weekday names are too short')

def get_weekday_names(width):
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This function is duplicated

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Do you mean the local get_weekday_names function? Or did you mean the test_locale_calendar_short_weekday_names vs test_locale_calendar_long_weekday_names ? The latter two do different things. The first tests that locales with short names are NOT abbreviated needlessly; the second tests that locales with long names ARE abbreviated rather than truncated.

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I mean the helper, get_weekday_names

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Yes. Is that important in a test? Do you prefer that function be moved up to the global scope to avoid the duplication, or some other suggestion?

return calendar.TextCalendar().formatweekheader(width).split()
self.assertEqual(get_weekday_names(4), get_weekday_names(9))

def test_locale_calendar_formatmonthname(self):
try:
# formatmonthname uses the same month names regardless of the width argument.
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2025-08-06-16-54-22.gh-issue-137481.eSTkK0.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Calendar uses the lengths of the locale's weekdays to decide if the width
requires abbreviation.
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