https://github.com/python/cpython/commit/4877f4343cdac631677a69430d68cfdc240b5178
commit: 4877f4343cdac631677a69430d68cfdc240b5178
branch: 3.14
author: Miss Islington (bot) <31488909+miss-isling...@users.noreply.github.com>
committer: serhiy-storchaka <storch...@gmail.com>
date: 2025-07-03T11:22:03Z
summary:
[3.14] gh-130664: Treat '0' fill character with align '=' as zero-padding for
Fraction's (GH-131067) (GH-136241)
(cherry picked from commit c113a8e5236b31217d82ce289d3df6ec9e8411cd)
Co-authored-by: Sergey B Kirpichev <skirpic...@gmail.com>
files:
A Misc/NEWS.d/next/Library/2025-03-11-05-24-14.gh-issue-130664.g0yNMm.rst
M Lib/fractions.py
M Lib/test/test_fractions.py
diff --git a/Lib/fractions.py b/Lib/fractions.py
index 8163e3bb594f6b..ef296fd6a0f632 100644
--- a/Lib/fractions.py
+++ b/Lib/fractions.py
@@ -504,6 +504,9 @@ def _format_float_style(self, match):
trim_point = not alternate_form
exponent_indicator = "E" if presentation_type in "EFG" else "e"
+ if align == '=' and fill == '0':
+ zeropad = True
+
# Round to get the digits we need, figure out where to place the point,
# and decide whether to use scientific notation. 'point_pos' is the
# relative to the _end_ of the digit string: that is, it's the number
diff --git a/Lib/test/test_fractions.py b/Lib/test/test_fractions.py
index 96b3f30519459b..50020cd8ac5a84 100644
--- a/Lib/test/test_fractions.py
+++ b/Lib/test/test_fractions.py
@@ -1480,11 +1480,8 @@ def test_format_f_presentation_type(self):
(F('-1234.5678'), '08,.0f', '-001,235'),
(F('-1234.5678'), '09,.0f', '-0,001,235'),
# Corner-case - zero-padding specified through fill and align
- # instead of the zero-pad character - in this case, treat '0' as a
- # regular fill character and don't attempt to insert commas into
- # the filled portion. This differs from the int and float
- # behaviour.
- (F('1234.5678'), '0=12,.2f', '00001,234.57'),
+ # instead of the zero-pad character.
+ (F('1234.5678'), '0=12,.2f', '0,001,234.57'),
# Corner case where it's not clear whether the '0' indicates zero
# padding or gives the minimum width, but there's still an obvious
# answer to give. We want this to work in case the minimum width
diff --git
a/Misc/NEWS.d/next/Library/2025-03-11-05-24-14.gh-issue-130664.g0yNMm.rst
b/Misc/NEWS.d/next/Library/2025-03-11-05-24-14.gh-issue-130664.g0yNMm.rst
new file mode 100644
index 00000000000000..dbe783a2a99e0a
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-03-11-05-24-14.gh-issue-130664.g0yNMm.rst
@@ -0,0 +1,4 @@
+Handle corner-case for :class:`~fractions.Fraction`'s formatting: treat
+zero-padding (preceding the width field by a zero (``'0'``) character) as an
+equivalent to a fill character of ``'0'`` with an alignment type of ``'='``,
+just as in case of :class:`float`'s.
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