factorial, repeating

[deanhystad]

I believe all is asked for is wrapping a loop around the loop. To elaborate slightly on Gribouillis:

while True:
    try:
        n = int(input('Enter number or done: '))
    except ValueError:
        break  # Quit if input is not a number

    factorial = 1
    for i in range(1, n+1):
        factorial *= i
    print(f'{n}! = {factorial}')