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[3.14] gh-106318: Add examples for str.casefold() and str.lower() methods (GH-142154) (#143524)

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gh-106318: Add examples for str.casefold() and str.lower() methods (GH-142154)
(cherry picked from commit 51a56a3a7b)

Co-authored-by: Adorilson Bezerra <adorilson@gmail.com>
Co-authored-by: Victor Stinner <vstinner@python.org>
Co-authored-by: Stan Ulbrych <89152624+StanFromIreland@users.noreply.github.com>
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Miss Islington (bot) 2026-01-07 18:03:20 +01:00 • committed by GitHub
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Doc/library/stdtypes.rst
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@ -1844,6 +1844,14 @@ expression support in the :mod:`re` module).
lowercase letter ``'ß'`` is equivalent to ``"ss"``. Since it is already
lowercase, :meth:`lower` would do nothing to ``'ß'``; :meth:`casefold`
converts it to ``"ss"``.
For example:
.. doctest::
>>> 'straße'.lower()
'straße'
>>> 'straße'.casefold()
'strasse'
The casefolding algorithm is
`described in section 3.13 'Default Case Folding' of the Unicode Standard
@ -2300,7 +2308,12 @@ expression support in the :mod:`re` module).
.. method:: str.lower()
Return a copy of the string with all the cased characters [4]_ converted to
lowercase.
lowercase. For example:
.. doctest::
>>> 'Lower Method Example'.lower()
'lower method example'
The lowercasing algorithm used is
`described in section 3.13 'Default Case Folding' of the Unicode Standard