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Remove ambiguous part in docstring of functools.reduce() #137130

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Remove ambiguous part in docstring of functools.reduce() #137130

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5 changes: 3 additions & 2 deletions Lib/functools.py
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Original file line number Diff line number Diff line change
Expand Up @@ -241,8 +241,9 @@ def reduce(function, sequence, initial=_initial_missing):
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.
it is placed before the items of the iterable in the calculation. If the iterable is empty and
initial is given, initial will be returned. If initial is not given and iterable contains only
one item, the first item is returned.

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