Python factorial function
Python factorial(x) function returns the x factorial. x should be an integer and greater than 0. It's a method of math module.
x! = 1 * 2 * 3 * ... * (x-1) * x
0! = 1
>>> import math >>> math.factorial(0)#0!
1
>>> math.factorial(1)#1!
1
>>> math.factorial(2)#2!
2
>>> math.factorial(3)#3!
6
>>> math.factorial(4)#4!
24
>>> math.factorial(5)#5!
120
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