Project 14: Newsletter Form

Python Challenge

Builds on these lessons

Composition Vs Inheritance Design Patterns Abstract Base Classes

Step 1 of 3

Project

An Abstract Base Class for Validators

Define class Validator(ABC): with an @abstractmethod validate(self, value) method that has no body — a contract, not an implementation. Python refuses to instantiate Validator directly, or any subclass that doesn't implement validate, which catches an incomplete implementation immediately rather than at some confusing runtime moment later.

🎯 Your Task

Please add the exact code shown in the light gray box below to your editor.Do not delete your previous code, just insert these new lines in the correct place!

from abc import ABC, abstractmethod

class Validator(ABC):
    @abstractmethod
    def validate(self, value):
        ...

class EmailValidator(Validator):
    def validate(self, value):
        return "@" in value

print(EmailValidator().validate("reader@example.com"))

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