HackerRank- Python Solutions

Python Day 9: Recursion 3

Write a factorial function that takes a positive integer, N as a parameter and prints the result of N! (N factorial).

Note: If you fail to use recursion or fail to name your recursive function factorial or Factorial, you will get a score of 0.

#!/bin/python3

import math
import os
import random
import re
import sys

# Complete the factorial function below.
def factorial(n):

    for i in range (1, n):
        n= n*i
    return n

if __name__ == '__main__':
    fptr = open(os.environ['OUTPUT_PATH'], 'w')

    n = int(input())

    result = factorial(n)

    fptr.write(str(result) + '\n')

    fptr.close()