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Diffstat (limited to 'Doc/library/itertools.rst')
| -rw-r--r-- | Doc/library/itertools.rst | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/Doc/library/itertools.rst b/Doc/library/itertools.rst index f489535..1f0bced 100644 --- a/Doc/library/itertools.rst +++ b/Doc/library/itertools.rst @@ -87,10 +87,15 @@ loops that truncate the stream. .. function:: accumulate(iterable[, func]) - Make an iterator that returns accumulated sums. Elements may be any addable - type including :class:`~decimal.Decimal` or :class:`~fractions.Fraction`. - If the optional *func* argument is supplied, it should be a function of two - arguments and it will be used instead of addition. + Make an iterator that returns accumulated sums, or accumulated + results of other binary functions (specified via the optional + *func* argument). If *func* is supplied, it should be a function + of two arguments. Elements of the input *iterable* may be any type + that can be accepted as arguments to *func*. (For example, with + the default operation of addition, elements may be any addable + type including :class:`~decimal.Decimal` or + :class:`~fractions.Fraction`.) If the input iterable is empty, the + output iterable will also be empty. Equivalent to:: |