Python Program to Find Factorial of Number Using Recursion

Factorial: Factorial of a number specifies a product of all integers from 1 to that number. It is defined by the symbol explanation mark (!).
For example: The factorial of 5 is denoted as 5! = 1*2*3*4*5 = 120.

See this example:

1. def recur_factorial(n):  
2.    if n == 1:  
3.        return n  
4.    else:  
5.        return n*recur_factorial(n-1)  
6. # take input from the user  
7. num = int(input("Enter a number: "))  
8. # check is the number is negative  
9. if num < 0:  
10.    print("Sorry, factorial does not exist for negative numbers")  
11. elif num == 0:  
12.    print("The factorial of 0 is 1")  
13. else:  
14.    print("The factorial of",num,"is",recur_factorial(num))  

Output: