Web Reference: Jul 23, 2025 · A factorial is positive integer n, and denoted by n!. Then the product of all positive integers less than or equal to n. n! = n* (n-1)* (n-2)* (n-3)*....*1. For example: 5! = 5*4*3*2*1 = 120. In this article, we are going to calculate the factorial of a number using recursion. Examples: Output: 120. Input: 6. Output: 720. Implementation: As you can see the fulfilling the if condition leads to the code that actually ends the "loop" and this is the most important part of a recursive function. In contrast, the else part of the condition leads to calling recursivefactorial function once again which is effectively a kind of loop. To write a recursive function in Python, you define a base case (which stops the recursion) and then write the recursive step (where the function calls itself). For factorial, the base case is when n==0. In all other cases, the function calls itself with n-1 and multiplies the result by n.
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