Using Gooey as a Universal Front End for Any Language or CLI Application
From the link:<p>gooey_options={    # NEW!
    'validator': {
        'test': 'user_input.isdigit()',
        'message': 'Please enter a number'
    }
})<p>'test': 'user_input.isdigit()',<p>'user_input.isdigit()'<p>'o'