Factorial in python

Mathematically, the formula for the factorial is as follows. If n is an integer greater than or equal to 1, then n ! = n ( n - 1)( n - 2)( n - 3) ... (3)(2)(1) If p = 0, then p ! = 1 by convention.

def factorial(n):
    if n == 0:
        return 1
    else:
        return n * factorial(n-1)

Hope this helps

Varun Pant

Factorial in python  by  Varun Pant