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gh-155339: Document the change of behaviour about parsing negative numbers from 3.14 in argparse #155340

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gh-155339: Document the change of behaviour about parsing negative numbers from 3.14 in argparse #155340

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175c53a
Clarify the change of behaviour from 3.14 about parsing negative numbers
ptim0626 Aug 7, 2026
0e0c6b8
Remove e.g. usage per the style guide
ptim0626 Aug 7, 2026
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5 changes: 5 additions & 0 deletions Doc/library/argparse.rst
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Expand Up @@ -1624,6 +1624,11 @@ argument::
See also :ref:`the argparse howto on ambiguous arguments <specifying-ambiguous-arguments>`
for more details.

.. versionchanged:: 3.14
Negative numbers in scientific notation (``-2.5e-6``), with underscores
(``-1_234.5``) and complex numbers (``-1.2e-3j``) are recognized as
negative numbers.

Comment on lines +1627 to +1631

@savannahostrowski savannahostrowski Aug 7, 2026

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Suggested change
.. versionchanged:: 3.14
Negative numbers in scientific notation (``-2.5e-6``), with underscores
(``-1_234.5``) and complex numbers (``-1.2e-3j``) are recognized as
negative numbers.
.. 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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