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| -rw-r--r-- | Doc/library/functions.rst | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst index 5be4edd..3845f19 100644 --- a/Doc/library/functions.rst +++ b/Doc/library/functions.rst @@ -1058,7 +1058,19 @@ available. They are listed here in alphabetical order. it is placed before the items of the iterable in the calculation, and serves as a default when the iterable is empty. If *initializer* is not given and *iterable* contains only one item, the first item is returned. - + Roughly equivalent to:: + + def reduce(function, iterable, initializer=None): + it = iter(iterable) + if initializer is None: + try: + initializer = next(it) + except StopIteration: + raise TypeError('reduce() of empty sequence with no initial value') + accum_value = initializer + for x in iterable: + accum_value = function(accum_value, x) + return accum_value .. function:: reload(module) |