[issue2138] Add a factorial function

[Joshua Uziel]

Joshua Uziel <python at uzix.org> added the comment:

It's a simplified version, but why not something like this:

import operator
def factorial(num):
    return reduce(operator.mul, range(1, num+1))

A product() function could also be done similarly.

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nosy: +uzi

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue2138>
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