Function for Factorial in Python

Question

In python, how to compute factorial of an integer?

Answer 1

Simplest way is to use math.factorial (Which is available from python 2.6 and above)

import math

math.factorial(1000)

You can also use an iterative approach:

def factorial(n):

    fact = 1

    for num in range(2, n + 1):

        fact *= num

    return fact

or recursive approach:

def factorial(n):

    if n < 2:

        return 1

    else:

        return n * factorial(n-1)

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