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How to Validate User Input with a Dataclass in Python

A dataclass stores name, age, and email, and a validator class checks each field, returning a dictionary of boolean results.

dataclass validation oop

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

  …

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