+1 vote

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

Aug 21, 2018 in Python 1,147 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
• 58,090 points

edited Aug 21, 2018 by Omkar

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