Need help with PYTHON!

In mathematics, the notation n ! represents the factorial of the nonnegative integer n. The factorial of n is the product of all the nonnegative integers from 1 to n. For example: 7!=1234567=5,040 Write a program that lets the user enter a nonnegative integer and then uses a loop to calculate the factorial of that number. Print the factorial to standard output. SAMPLE RUN \#1: python3 Factorial.py