python how to get the factorial code example

Example 1: python calculate factorial

def factorial(n):
    fact = 1
    for num in range(2, n + 1):
        fact = fact * num
    return(fact)

Example 2: factorial in python

def fact(n):
  return 1 if (n==0 or n==1) else n*fact(n-1)
fact(3)

Example 3: factorial in python

def fact(n):
	if n==0 or n==1:
		return 1
	else:
		return n*fact(n-1)
print(fact(4)) #4 is the sample value it will returns 4!==> 4*3*2*1 =24
#OR
import math
print(math.factorial(4))