Recursive Factorial Calculation in Python (Challenge)

Introduction

In mathematics, the factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example, 5! = 5 x 4 x 3 x 2 x 1 = 120. In this challenge, you will write a Python function to calculate the factorial of a given number using recursion.

Skills Graph

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Factorial

Problem

Write a function factorial(num) that takes a non-negative integer num as an argument and returns its factorial. The function should use recursion to calculate the factorial. If num is less than or equal to 1, return 1. Otherwise, return the product of num and the factorial of num - 1. The function should throw an exception if num is a negative or a floating-point number.

Example

factorial(6) ## 720