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gh-106318: Add example for str.isalnum() #137550

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gh-106318: Add example for str.isalnum() #137550

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85664f3
gh-106320: Remove private _PyInterpreterState functions (#106335)
vstinner Jul 2, 2023
9907d9b
Doc: minor change
adorilson Dec 30, 2023
ac028d7
Revert "Doc: minor change"
adorilson Mar 25, 2024
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gh-106318: Add example for str.isalnum()
adorilson Mar 14, 2021
7a1058b
gh-106318: Some improvements to str.isalnum() example
adorilson Aug 8, 2025
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gh-106318: Some improvements to str.isalnum() example
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@adorilson
adorilson committed Aug 8, 2025
commit 7a1058bf9694f3456433a153cfbb06d04b1620c7
9 changes: 5 additions & 4 deletions Doc/library/stdtypes.rst
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Expand Up @@ -1978,19 +1978,20 @@ expression support in the :mod:`re` module).
Return ``True`` if all characters in the string are alphanumeric and there is at
least one character, ``False`` otherwise. A character ``c`` is alphanumeric if one
of the following returns ``True``: ``c.isalpha()``, ``c.isdecimal()``,
``c.isdigit()``, or ``c.isnumeric()``.
``c.isdigit()``, or ``c.isnumeric()``. For example::

For example::
.. doctest::

>>> ''.isalnum()
False
>>> 'abc123'.isalnum()
True
>>> 'abc123!@#'.isalnum()
False
>>> ''.isalnum()
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@StanFromIreland StanFromIreland Aug 8, 2025

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IMO this is so similar to the last example I think it’s not necessary.

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@adorilson adorilson Aug 9, 2025

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Do you mean '' and ' '? I intended to show that an empty string is different from a space character. Frequently, people forget this.

False
>>> ' '.isalnum()
False


.. method:: str.isalpha()

Return ``True`` if all characters in the string are alphabetic and there is at least
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