""" Recursive implementation of factorial This function should be copied into the Python Tutor. That way you can see how recursion affects the call stack. Author: Walker M. White (wmw2) Date: October 10, 2017 (Python 3 Version) """ def factorial(n): """ Returns: n! Parameter n: the number to compute Precondition: n is a nonnegative integer """ if n==0: # Base case return 1 # Recursive case. return n*factorial(n-1) factorial(0) factorial(1) factorial(4)