In Python--Write a function factorial() that takes as input a nonnegative intege

Question

In Python--Write a function factorial() that takes as input a nonnegative integer and returns its factorial. Do not use the factorial function in the math module. That is, you must write your own function without using the math module. The factorial of a nonnegative integer N, denoted N!, is defined as follows:

N! = N x (N – 1) x (N – 2) x …..x 3 x 2 x 1

Factorial of 0 is 1

Factorial of 1 is 1. That is, 0! = 1 and 1! = 1

Sample runs are shown below:

>>> factorial(0)

1

>>> factorial(1)

1

>>> factorial(3)

6

>>> factorial(5)

120

Explanation / Answer

Complete Code:

File: factorial.py

Sample Output:

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