is alpha and is digit in input questions

Question

I'm creating a quiz game where if a user types a number beyond a set amount or a word instead, it forces it to print an error message and go back to the start. I understand how to use the > than for the number, but have tried to use string, string == False, not alpha etc and keep getting the same error messages regarding int and string.

    while True:
        quiz=int(input("What answer do you think is right? Choose 1- 20"))
        if quiz >20:
            print("Oops, That's too high")
        else:
            print("Not a number")
            continue:
            break

Possible duplicate of [Python: how to check if input is a number?](http://stackoverflow.com/questions/5424716/python-how-to-check-if-input-is-a-number) — Pier Paolo, Apr 17 '16 at 18:21
It's because after this I need to read data from a text file. — Canadian1010101, Apr 17 '16 at 19:02

score 0 · Answer 1 · answered Apr 17 '16 at 18:22

0

You're not checking that the string can actually be converted to an int, before typecasting your input to int.

You can use isdigit for this.

And you should be calling .isalpha() instead of isalpha

answered Apr 17 '16 at 18:22

Pythonista

11,377
2
31
50

I've read the links suggested, and made the changes.It doesn't work and I have the following error message: ValueError: invalid literal for int() with base 10: 'a' – Canadian1010101 Apr 17 '16 at 18:46
What does that mean cast to an int? – Canadian1010101 Apr 19 '16 at 18:51

is alpha and is digit in input questions

1 Answers1