https://github.com/python/cpython/commit/b2a2f032dcd82c676ab315374994227ca3a398d3
commit: b2a2f032dcd82c676ab315374994227ca3a398d3
branch: 3.14
author: Miss Islington (bot) <31488909+miss-isling...@users.noreply.github.com>
committer: hugovk <1324225+hug...@users.noreply.github.com>
date: 2025-07-07T09:50:02Z
summary:
[3.14] gh-130662: Accept leading zeros in precision/width for Fraction's
formatting (GH-130663) (#136361)
Co-authored-by: Sergey B Kirpichev <skirpic...@gmail.com>
Co-authored-by: Bénédikt Tran <10796600+picn...@users.noreply.github.com>
files:
A Misc/NEWS.d/next/Library/2025-06-02-14-28-30.gh-issue-130662.EIgIR8.rst
M Lib/fractions.py
M Lib/test/test_fractions.py
diff --git a/Lib/fractions.py b/Lib/fractions.py
index ef296fd6a0f632..aeae91ee4220e1 100644
--- a/Lib/fractions.py
+++ b/Lib/fractions.py
@@ -168,9 +168,9 @@ def _round_to_figures(n, d, figures):
# A '0' that's *not* followed by another digit is parsed as a minimum width
# rather than a zeropad flag.
(?P<zeropad>0(?=[0-9]))?
- (?P<minimumwidth>0|[1-9][0-9]*)?
+ (?P<minimumwidth>[0-9]+)?
(?P<thousands_sep>[,_])?
- (?:\.(?P<precision>0|[1-9][0-9]*))?
+ (?:\.(?P<precision>[0-9]+))?
(?P<presentation_type>[eEfFgG%])
""", re.DOTALL | re.VERBOSE).fullmatch
diff --git a/Lib/test/test_fractions.py b/Lib/test/test_fractions.py
index 50020cd8ac5a84..1875a2f529c957 100644
--- a/Lib/test/test_fractions.py
+++ b/Lib/test/test_fractions.py
@@ -1515,6 +1515,8 @@ def test_format_f_presentation_type(self):
(F(51, 1000), '.1f', '0.1'),
(F(149, 1000), '.1f', '0.1'),
(F(151, 1000), '.1f', '0.2'),
+ (F(22, 7), '.02f', '3.14'), # issue gh-130662
+ (F(22, 7), '005.02f', '03.14'),
]
for fraction, spec, expected in testcases:
with self.subTest(fraction=fraction, spec=spec):
@@ -1613,12 +1615,6 @@ def test_invalid_formats(self):
'=010%',
'>00.2f',
'>00f',
- # Too many zeros - minimum width should not have leading zeros
- '006f',
- # Leading zeros in precision
- '.010f',
- '.02f',
- '.000f',
# Missing precision
'.e',
'.f',
diff --git
a/Misc/NEWS.d/next/Library/2025-06-02-14-28-30.gh-issue-130662.EIgIR8.rst
b/Misc/NEWS.d/next/Library/2025-06-02-14-28-30.gh-issue-130662.EIgIR8.rst
new file mode 100644
index 00000000000000..e07200f9a3fbbd
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-06-02-14-28-30.gh-issue-130662.EIgIR8.rst
@@ -0,0 +1,3 @@
+Accept leading zeros in precision and width fields for
+:class:`~fractions.Fraction` formatting, for example ``format(Fraction(1,
+3), '.016f')``.
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