response.py

r"""
When creating a Google Form that prompts users for a short answer (or
paragraph), it’s possible to enable response validation and require that the
user’s input match a regular expression. For instance, you could require that a
user input an email address with a regex like this one:

^[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$
Or you could more easily use Google’s built-in support for validating an email
address, per the screenshot below, much like you could use a library in your own
code:

In a file called response.py, using either validator-collection or validators
from PyPI, implement a program that prompts the user for an email address via
input and then prints Valid or Invalid, respectively, if the input is a
syntatically valid email address. You may not use re. And do not validate
whether the email address’s domain name actually exists.
"""

from validator_collection import validators, errors


def main():
    email = str(input("What's your email address? "))
    try:
        is_valid = validators.email(email)
        if is_valid:
            print("Valid")
        else:
            print("Invalid")
    except errors.InvalidEmailError:
        print("Invalid")


if __name__ == "__main__":
    main()