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bpo-31082: Use "iterable" in the docstring for functools.reduce() (GH-20796)

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Zackery Spytz 2020-06-28 00:40:54 -06:00 committed by GitHub
parent 8ab77c6f9f
commit cd3c2bdd5d
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3 changed files with 16 additions and 14 deletions
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15
Lib/functools.py
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@ -236,14 +236,14 @@ def __ge__(self, other):
def reduce(function, sequence, initial=_initial_missing):
"""
reduce(function, sequence[, initial]) -> value
reduce(function, iterable[, initial]) -> value
Apply a function of two arguments cumulatively to the items of a sequence,
from left to right, so as to reduce the sequence to a single value.
For example, reduce(lambda x, y: x+y, [1, 2, 3, 4, 5]) calculates
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 sequence in the calculation, and serves as a default when the
sequence is empty.
of the iterable in the calculation, and serves as a default when the
iterable is empty.
"""
it = iter(sequence)
@ -252,7 +252,8 @@ def reduce(function, sequence, initial=_initial_missing):
try:
value = next(it)
except StopIteration:
raise TypeError("reduce() of empty sequence with no initial value") from None
raise TypeError(
"reduce() of empty iterable with no initial value") from None
else:
value = initial

1
Misc/NEWS.d/next/Library/2020-06-25-10-11-47.bpo-31082.HsgDkx.rst Normal file
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@ -0,0 +1 @@
Use the term "iterable" in the docstring for :func:`functools.reduce`.

14
Modules/_functoolsmodule.c
View file

@ -679,7 +679,7 @@ functools_reduce(PyObject *self, PyObject *args)
if (result == NULL)
PyErr_SetString(PyExc_TypeError,
"reduce() of empty sequence with no initial value");
"reduce() of empty iterable with no initial value");
Py_DECREF(it);
return result;
@ -692,14 +692,14 @@ functools_reduce(PyObject *self, PyObject *args)
}
PyDoc_STRVAR(functools_reduce_doc,
"reduce(function, sequence[, initial]) -> value\n\
"reduce(function, iterable[, initial]) -> value\n\
\n\
Apply a function of two arguments cumulatively to the items of a sequence,\n\
from left to right, so as to reduce the sequence to a single value.\n\
For example, reduce(lambda x, y: x+y, [1, 2, 3, 4, 5]) calculates\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 sequence in the calculation, and serves as a default when the\n\
sequence is empty.");
of the iterable in the calculation, and serves as a default when the\n\
iterable is empty.");
/* lru_cache object **********************************************************/