# Calling it's factorial recursively
def factorial(n):
if n == 0:
return 1
else:
return n * factorial(n-1)
# Fastest way in Python 2.6+
import math
math.factorial(n)
Factorial function written in Python. To calculate the factorial of a non-negative integer x, just multiply all the integers from 1 through x.
For example:
factorial(4) would equal 4 * 3 * 2 * 1, which is 24.
factorial(1) would equal 1.
factorial(3) would equal 3 * 2 * 1, which is 6.
For example:
factorial(4) would equal 4 * 3 * 2 * 1, which is 24.
factorial(1) would equal 1.
factorial(3) would equal 3 * 2 * 1, which is 6.
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