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Fix pluralize for words ending in z #586

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Fix pluralize for words ending in z #586

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b4ce721
fix pluralize adding a bare s to words ending in z
Debasishhh Oct 16, 2026
b4c338e
add quiz to irregular plurals so it doubles the z
Debasishhh Oct 16, 2026
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3 changes: 2 additions & 1 deletion boltons/strutils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -258,7 +258,7 @@ def pluralize(word):
plural = irr_plural
elif word.endswith('y') and word[-2:-1] not in 'aeiou':
plural = word[:-1] + 'ies'
elif word[-1] in 'sx' or word.endswith('ch') or word.endswith('sh'):
elif word[-1] in 'sxz' or word.endswith('ch') or word.endswith('sh'):
plural = word if word.endswith('es') else word + 'es'
else:
plural = word + 's'
Expand Down Expand Up @@ -303,6 +303,7 @@ def _match_case(master, disciple):
'octopus': 'octopi', 'offspring': 'offspring', 'ovum': 'ova',
'ox': 'oxen', 'paralysis': 'paralyses', 'parenthesis': 'parentheses',
'person': 'people', 'phenomenon': 'phenomena', 'potato': 'potatoes',
'quiz': 'quizzes',
'radius': 'radii', 'scarf': 'scarves', 'scissors': 'scissors',
'self': 'selves', 'sense': 'senses', 'series': 'series', 'sheep':
'sheep', 'shelf': 'shelves', 'species': 'species', 'stimulus':
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9 changes: 9 additions & 0 deletions tests/test_strutils.py
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Expand Up @@ -397,3 +397,12 @@ def test_args2cmd_sep():
assert strutils.args2cmd(['aa', 'bb']) == 'aa bb'
assert strutils.args2cmd(['aa', 'bb'], sep='|') == 'aa|bb'
assert strutils.args2cmd(['a a', 'bb'], sep='|') == '"a a"|bb'


def test_pluralize_z():
pluralize = strutils.pluralize
assert pluralize('buzz') == 'buzzes'
assert pluralize('waltz') == 'waltzes'
assert pluralize('Fizz') == 'Fizzes'
assert pluralize('quiz') == 'quizzes'
assert strutils.singularize('quizzes') == 'quiz'