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bpo-27385: Clarify docstring for groupby() (#3738)

This commit is contained in:
Raymond Hettinger 2017-09-25 01:21:06 -07:00 committed by GitHub
parent 57c2561c8c
commit 49392c63a2
2 changed files with 4 additions and 3 deletions
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2
Doc/library/itertools.rst
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@ -53,7 +53,7 @@ Iterator Arguments Results
:func:`compress` data, selectors (d[0] if s[0]), (d[1] if s[1]), ... ``compress('ABCDEF', [1,0,1,0,1,1]) --> A C E F``
:func:`dropwhile` pred, seq seq[n], seq[n+1], starting when pred fails ``dropwhile(lambda x: x<5, [1,4,6,4,1]) --> 6 4 1``
:func:`filterfalse` pred, seq elements of seq where pred(elem) is false ``filterfalse(lambda x: x%2, range(10)) --> 0 2 4 6 8``
:func:`groupby` iterable[, keyfunc] sub-iterators grouped by value of keyfunc(v)
:func:`groupby` iterable[, key] sub-iterators grouped by value of key(v)
:func:`islice` seq, [start,] stop [, step] elements from seq[start:stop:step] ``islice('ABCDEFG', 2, None) --> C D E F G``
:func:`starmap` func, seq func(\*seq[0]), func(\*seq[1]), ... ``starmap(pow, [(2,5), (3,2), (10,3)]) --> 32 9 1000``
:func:`takewhile` pred, seq seq[0], seq[1], until pred fails ``takewhile(lambda x: x<5, [1,4,6,4,1]) --> 1 4``

5
Modules/itertoolsmodule.c
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@ -176,8 +176,9 @@ static PyMethodDef groupby_methods[] = {
};
PyDoc_STRVAR(groupby_doc,
"groupby(iterable[, keyfunc]) -> create an iterator which returns\n\
(key, sub-iterator) grouped by each value of key(value).\n");
"groupby(iterable, key=None) -> make an iterator that returns consecutive\n\
keys and groups from the iterable. If the key function is not specified or\n\
is None, the element itself is used for grouping.\n");
static PyTypeObject groupby_type = {
PyVarObject_HEAD_INIT(NULL, 0)