Factorial of a number is product of all numbers from 1 to that number.
A function is called a recursive function if it calls itself.
In following program factorial() function accepts one argument and keeps calling itself by reducing value by one till it reaches 1.
def factorial(x): if x==1: return 1 else: return x*factorial(x-1) f=factorial(5) print ("factorial of 5 is ",f)
The result is
factorial of 5 is 120