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Code Issues Projects Releases Packages Wiki Activity Actions 13

gh-130662: Accept leading zeros in precision/width for Decimal's formatting (#132549)

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Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
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Sergey B Kirpichev 2025-06-02 16:30:52 +03:00 • committed by GitHub
parent 5bc2d99126
commit 9c72658e49
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3 changed files with 7 additions and 2 deletions
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4
Lib/_pydecimal.py
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@ -6120,9 +6120,9 @@ _parse_format_specifier_regex = re.compile(r"""\A
(?P<no_neg_0>z)? (?P<no_neg_0>z)?
(?P<alt>\#)? (?P<alt>\#)?
(?P<zeropad>0)? (?P<zeropad>0)?
(?P<minimumwidth>(?!0)\d+)? (?P<minimumwidth>\d+)?
(?P<thousands_sep>[,_])? (?P<thousands_sep>[,_])?
(?:\.(?P<precision>0|(?!0)\d+))? (?:\.(?P<precision>\d+))?
(?P<type>[eEfFgGn%])? (?P<type>[eEfFgGn%])?
\z \z
""", re.VERBOSE|re.DOTALL) """, re.VERBOSE|re.DOTALL)

2
Lib/test/test_decimal.py
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@ -981,6 +981,7 @@ class FormatTest:
('.0f', '0e-2', '0'), ('.0f', '0e-2', '0'),
('.0f', '3.14159265', '3'), ('.0f', '3.14159265', '3'),
('.1f', '3.14159265', '3.1'), ('.1f', '3.14159265', '3.1'),
('.01f', '3.14159265', '3.1'), # leading zero in precision
('.4f', '3.14159265', '3.1416'), ('.4f', '3.14159265', '3.1416'),
('.6f', '3.14159265', '3.141593'), ('.6f', '3.14159265', '3.141593'),
('.7f', '3.14159265', '3.1415926'), # round-half-even! ('.7f', '3.14159265', '3.1415926'), # round-half-even!
@ -1066,6 +1067,7 @@ class FormatTest:
('8,', '123456', ' 123,456'), ('8,', '123456', ' 123,456'),
('08,', '123456', '0,123,456'), # special case: extra 0 needed ('08,', '123456', '0,123,456'), # special case: extra 0 needed
('+08,', '123456', '+123,456'), # but not if there's a sign ('+08,', '123456', '+123,456'), # but not if there's a sign
('008,', '123456', '0,123,456'), # leading zero in width
(' 08,', '123456', ' 123,456'), (' 08,', '123456', ' 123,456'),
('08,', '-123456', '-123,456'), ('08,', '-123456', '-123,456'),
('+09,', '123456', '+0,123,456'), ('+09,', '123456', '+0,123,456'),

3
Misc/NEWS.d/next/Library/2025-06-02-14-36-28.gh-issue-130662.Gpr2GB.rst Normal file
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@ -0,0 +1,3 @@
+Accept leading zeros in precision and width fields for
+:class:`~decimal.Decimal` formatting, for example ``format(Decimal(1.25),
'.016f')``.