How to Validate User Input with a Dataclass in Python

from dataclasses import dataclass


@dataclass
class UserInput:
    name: str
    age: int
    email: str

    def is_valid_name(self) -> bool:
        return bool(self.name.strip()) and len(self.name.strip()) >= 2

    def is_valid_age(self) -> bool:
        return isinstance(self.age, int) and 0 < self.age < 150

    def is_valid_email(self) -> bool:
        return "@" in self.email and self.email.count("@") == 1


class InputValidator:
    def __init__(self, data: UserInput):
        self.data = data

    def validate(self) -> dict:
        checks = {
            "name": self.data.is_valid_name(),
            "age": self.data.is_valid_age(),
            "email": self.data.is_valid_email(),
        }
        return checks

    def is_all_valid(self) -> bool:
        return all(self.validate().values())


if __name__ == "__main__":
    sample = UserInput(name="Alice", age=25, email="alice@example.com")
    validator = InputValidator(sample)
    print(validator.validate())
    print(f"All valid: {validator.is_all_valid()}")