factorial of a number python recursion code example

Example 1: factorial of a number using recursion in python

# Factorial of a number using recursion

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

num = 7

# check if the number is negative
if num < 0:
   print("Sorry, factorial does not exist for negative numbers")
elif num == 0:
   print("The factorial of 0 is 1")
else:
   print("The factorial of", num, "is", recur_factorial(num))

Example 2: python calculate factorial

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