8000 GH-91415: Mention alphabetical sort ordering in the Sorting HOWTO by rhettinger · Pull Request #98336 · python/cpython · GitHub
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GH-91415: Mention alphabetical sort ordering in the Sorting HOWTO #98336

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Oct 16, 2022
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GH-91415: Mention alphabetical sort ordering in the Sorting HOWTO #98336

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GH-91415: Mention alphabetical sort ordering in the Sorting HOWTO
rhettinger Oct 16, 2022
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Fix markup
rhettinger Oct 16, 2022
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Working and grammar tweaks.
rhettinger Oct 16, 2022
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Working and grammar tweaks.
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rhettinger committed Oct 16, 2022
commit f5dece4b6b8417781af29377a08ff2a79b79fb41
15 changes: 7 additions & 8 deletions Doc/howto/sorting.rst
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Expand Up @@ -234,18 +234,17 @@ a comparison function computes the relative ordering for two inputs.

For example, a `balance scale
<https://upload.wikimedia.org/wikipedia/commons/1/17/Balance_à_tabac_1850.JPG>`_
compares two samples giving a relative ordering of lighter, heavier, or
equal. Likewise, comparison function ``cmp(a, b)`` returns a negative
value for less-than, a positive value for greater-than, or zero if the
inputs are equal.
compares two samples giving a relative ordering: lighter, equal, or heavier.
Likewise, a comparison functions such as ``cmp(a, b)`` will a negative value for
less-than, zero if the inputs are equal, or a positive value for greater-than.

It is common to find comparison functions when translating algorithms
from other languages. And sometimes, libraries provide comparison
functions. For example, :func:`locale.strcoll` is a comparison function.
It is common to encounter comparison functions when translating algorithms from
other languages. Also, some libraries provide comparison functions as part of
their API. For example, :func:`locale.strcoll` is a comparison function.

To accommodate those situations, Python provides
:class:`functools.cmp_to_key` to wrap the comparison function
making it usable as a key function::
to make it usable as a key function::

sorted(words, key=cmp_to_key(strcoll)

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