Write a Python program factorial.py - This code should prompt the user for a value, and then compute (and print out) the factorial of that value. Recall that n! = 1 * 2 * 3 * ... * (n-1) * n.

0! is defined to be 1

Below are some examples of how the output should look. **Cannot use value-returning functions**

$ python3 factorial.py >>> Enter a number: 4 <<< 4! = 24 $ python3 factorial.py >>> Enter a number: 5 <<< 5! = 120