What is the function for Factorial in Python

+1 vote

How do I go about computing a factorial of an integer in Python?

Aug 21, 2018 in Python by bug_seeker
• 15,310 points
98 views

1 answer to this question.

0 votes

Easiest way: math.factorial(x) (available in 2.6 and above).

If you want/have to write it yourself, use something like

def factorial(n):

    return reduce(lambda x,y:x*y,[1]+range(1,n+1))

or something more readable:

def factorial(n):

    if n == 0: 

        return 1 

    else: 

        return n * factorial(n-1)

As always, Google is your friend ;)

answered Aug 21, 2018 by Priyaj
• 56,160 points

edited Aug 21, 2018 by Omkar

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