How do I make it say ‘Error’ when input for factorial is 0

Question

Currently it gives the wrong answer when input for Factorial is negative. How do I make it have an error message

https://code.sololearn.com/cFGQs3orqwRc/?ref=app

Answer 1

Use something like this
if num < 0 or not num.is_integer():
print('Error')
continue