Dataclasses and property decorator

Question

I\'ve been reading up on Python 3.7\'s dataclass as an alternative to namedtuples (what I typically use when having to group data in a structure). I was wondering if datacla

Answer 1

Here's another way which allows you to have fields without a leading underscore:

from dataclasses import dataclass


@dataclass
class Person:
    name: str = property

    @name
    def name(self) -> str:
        return self._name

    @name.setter
    def name(self, value) -> None:
        self._name = value

    def __post_init__(self) -> None:
        if isinstance(self.name, property):
            self.name = 'Default'

The result is:

print(Person().name)  # Prints: 'Default'
print(Person('Joel').name)  # Prints: 'Joel'
print(repr(Person('Jane')))  # Prints: Person(name='Jane')