factorial.py

choice = "y"

while choice.lower() == "y":
    number = int(input("Enter a number to calculate factorial: "))

    result = 1
    for i in range(1, number + 1):
        # Factorial = 1 x 2 x 3 x ... x n
        result *= i

    print(number, "factorial is", result)

    choice = input("Calculate another? y/n: ")