https://github.com/python/cpython/commit/1b1c61a94f0685bb0be707b5374376f3084159fe
commit: 1b1c61a94f0685bb0be707b5374376f3084159fe
branch: 3.14
author: Miss Islington (bot) <[email protected]>
committer: savannahostrowski <[email protected]>
date: 2026-08-07T19:00:51-07:00
summary:

[3.14] gh-155339: Document the change of behaviour about parsing negative 
numbers from 3.14 in argparse (GH-155340) (#155372)

gh-155339: Document the change of behaviour about parsing negative numbers from 
3.14 in argparse (GH-155340)
(cherry picked from commit 8ed1479619a3487af72a7c44bf61c9711370d4da)

Co-authored-by: Timothy Poon <[email protected]>
Co-authored-by: Savannah Ostrowski <[email protected]>

files:
M Doc/library/argparse.rst

diff --git a/Doc/library/argparse.rst b/Doc/library/argparse.rst
index 9709d7e4435770..6e3d0fea9ec9b0 100644
--- a/Doc/library/argparse.rst
+++ b/Doc/library/argparse.rst
@@ -1601,6 +1601,11 @@ argument::
 See also :ref:`the argparse howto on ambiguous arguments 
<specifying-ambiguous-arguments>`
 for more details.
 
+.. versionchanged:: 3.14
+   Negative-number matching was expanded to include numbers in scientific
+   notation (``-2.5e-6``), numbers containing underscores (``-1_234.5``),
+   and complex numbers (``-1.2e-3j``).
+
 .. _prefix-matching:
 
 Argument abbreviations (prefix matching)

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