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gh-106318: Improve str.lower() docs #144848

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gh-106318: Improve str.lower() docs
adorilson Feb 15, 2026
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gh-106318: Replace latin abreviation on str.lower() docs
adorilson Feb 16, 2026
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14 changes: 14 additions & 0 deletions Doc/library/stdtypes.rst
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Expand Up @@ -2437,6 +2437,20 @@ expression support in the :mod:`re` module).
>>> 'Lower Method Example'.lower()
'lower method example'

Note that ``s.lower().islower()`` might be ``False`` if ``s``
contains uncased characters or if the Unicode category of the resulting
character(s) is not "Lu" (Letter, uppercase), but e.g. "Lt" (Letter,
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titlecase).

For example, see the word "Python" written in Punjabi, the most spoken
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@StanFromIreland StanFromIreland Feb 15, 2026

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I don’t think the fact is particularly interesting nor helpful, I think it just unnecessarily extends the section.

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@adorilson adorilson Feb 16, 2026

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Do you mean the whole adding or only the example?

The note paragraph was based on what already exists in the str.upper() docs. If this exists there, I think it makes sense exist here too.

The example I've suggested adds to str.upper() docs on #144638. I would prefer a more Occidental example, but I couldn't find one. I think examples are important.

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@StanFromIreland StanFromIreland Feb 16, 2026

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I was referring to specifically the "most spoken language in..." fact.

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@StanFromIreland StanFromIreland Feb 16, 2026

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I was referring to specifically the "most spoken language in..." fact.

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@adorilson adorilson Feb 16, 2026

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Oh, nice. I've put it because if I see only "written in Punjabi", I would think "wtf is Punjabi?". Of course, I would search about that, but I thought it could be ended here.

That being said, we can:

  1. Keep it (in case you change your mind)
  2. Reduce to "written in Punjabi, a language from Paskitan"
  3. Reduce more to "written in Punjabi"
  4. 3 + adding a link to the Punjabi Wikipedia entry.

What do you prefer?

language in Pakistan:

.. doctest::

>>> 'ازگر'.lower().islower()
False


The lowercasing algorithm used is `described in section 3.13.2 'Default Case
Conversion' of the Unicode Standard
<https://www.unicode.org/versions/Unicode17.0.0/core-spec/chapter-3/#G34078>`__.
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