Recursive Factorial Function in Python

This function calculates the factorial of a non-negative integer. The factorial is a recursive concept, where n! is defined as n times the factorial of n-1, and so on, until it reaches 1.

Technology Stack : Recursion

Code Type : Recursive function

Code Difficulty : Intermediate

                
                    
def factorial(n, accumulator=1):
    if n < 0:
        raise ValueError("n must be a non-negative integer")
    if n == 0:
        return accumulator
    return factorial(n - 1, n * accumulator)