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[3.13] Align functools.reduce() docstring with PEP-257 (GH-126045) #126113

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Oct 29, 2024
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[3.13] Align functools.reduce() docstring with PEP-257 (GH-126045) #126113

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14 changes: 8 additions & 6 deletions Lib/functools.py
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Original file line number Diff line number Diff line change
Expand Up @@ -239,12 +239,14 @@ def reduce(function, sequence, initial=_initial_missing):
"""
reduce(function, iterable[, initial], /) -> value

Apply a function of two arguments cumulatively to the items of a sequence
or iterable, from left to right, so as to reduce the iterable to a single
value. For example, reduce(lambda x, y: x+y, [1, 2, 3, 4, 5]) calculates
((((1+2)+3)+4)+5). If initial is present, it is placed before the items
of the iterable in the calculation, and serves as a default when the
iterable is empty.
Apply a function of two arguments cumulatively to the items of an iterable, from left to right.

This effectively reduces the iterable to a single value. If initial is present,
it is placed before the items of the iterable in the calculation, and serves as
a default when the iterable is empty.

For example, reduce(lambda x, y: x+y, [1, 2, 3, 4, 5])
calculates ((((1 + 2) + 3) + 4) + 5).
"""

it = iter(sequence)
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14 changes: 8 additions & 6 deletions Modules/_functoolsmodule.c
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Expand Up @@ -780,12 +780,14 @@ functools_reduce(PyObject *self, PyObject *args)
PyDoc_STRVAR(functools_reduce_doc,
"reduce(function, iterable[, initial], /) -> value\n\
\n\
Apply a function of two arguments cumulatively to the items of a sequence\n\
or iterable, from left to right, so as to reduce the iterable to a single\n\
value. For example, reduce(lambda x, y: x+y, [1, 2, 3, 4, 5]) calculates\n\
((((1+2)+3)+4)+5). If initial is present, it is placed before the items\n\
of the iterable in the calculation, and serves as a default when the\n\
iterable is empty.");
Apply a function of two arguments cumulatively to the items of an iterable, from left to right.\n\
\n\
This effectively reduces the iterable to a single value. If initial is present,\n\
it is placed before the items of the iterable in the calculation, and serves as\n\
a default when the iterable is empty.\n\
\n\
For example, reduce(lambda x, y: x+y, [1, 2, 3, 4, 5])\n\
calculates ((((1 + 2) + 3) + 4) + 5).");

/* lru_cache object **********************************************************/

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