Georg Brandl added the comment:
What about
def reduce(function, iterable, initializer=None):
it = iter(iterable)
if initializer is None:
value = next(it)
else:
value = initializer
for element in it:
value = function(value, element)
return value
Remember, an equivalent doesn't have to be 100% compatible, it is a way for the
user to quickly get an idea what the function does.
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<http://bugs.python.org/issue19202>
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