https://github.com/python/cpython/commit/f87578f8317342e3795d3f2af39689388d3e6888
commit: f87578f8317342e3795d3f2af39689388d3e6888
branch: 3.14
author: Miss Islington (bot) <31488909+miss-isling...@users.noreply.github.com>
committer: hugovk <1324225+hug...@users.noreply.github.com>
date: 2025-07-07T09:55:35Z
summary:
[3.14] gh-130662: Accept leading zeros in precision/width for Decimal's
formatting (GH-132549) (#136362)
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/2025-06-02-14-36-28.gh-issue-130662.Gpr2GB.rst
M Lib/_pydecimal.py
M Lib/test/test_decimal.py
diff --git a/Lib/_pydecimal.py b/Lib/_pydecimal.py
index 46fa9ffcb1e056..781b38ec26ba33 100644
--- a/Lib/_pydecimal.py
+++ b/Lib/_pydecimal.py
@@ -6120,9 +6120,9 @@ def _convert_for_comparison(self, other,
equality_op=False):
(?P<no_neg_0>z)?
(?P<alt>\#)?
(?P<zeropad>0)?
-(?P<minimumwidth>(?!0)\d+)?
+(?P<minimumwidth>\d+)?
(?P<thousands_sep>[,_])?
-(?:\.(?P<precision>0|(?!0)\d+))?
+(?:\.(?P<precision>\d+))?
(?P<type>[eEfFgGn%])?
\z
""", re.VERBOSE|re.DOTALL)
diff --git a/Lib/test/test_decimal.py b/Lib/test/test_decimal.py
index 9e298401dc3dcc..ca2b0b18fb0a6d 100644
--- a/Lib/test/test_decimal.py
+++ b/Lib/test/test_decimal.py
@@ -982,6 +982,7 @@ def test_formatting(self):
('.0f', '0e-2', '0'),
('.0f', '3.14159265', '3'),
('.1f', '3.14159265', '3.1'),
+ ('.01f', '3.14159265', '3.1'), # leading zero in precision
('.4f', '3.14159265', '3.1416'),
('.6f', '3.14159265', '3.141593'),
('.7f', '3.14159265', '3.1415926'), # round-half-even!
@@ -1067,6 +1068,7 @@ def test_formatting(self):
('8,', '123456', ' 123,456'),
('08,', '123456', '0,123,456'), # special case: extra 0 needed
('+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'),
('+09,', '123456', '+0,123,456'),
diff --git
a/Misc/NEWS.d/next/Library/2025-06-02-14-36-28.gh-issue-130662.Gpr2GB.rst
b/Misc/NEWS.d/next/Library/2025-06-02-14-36-28.gh-issue-130662.Gpr2GB.rst
new file mode 100644
index 00000000000000..d97d937376a9d0
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-06-02-14-36-28.gh-issue-130662.Gpr2GB.rst
@@ -0,0 +1,3 @@
++Accept leading zeros in precision and width fields for
++:class:`~decimal.Decimal` formatting, for example ``format(Decimal(1.25),
+'.016f')``.
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