Help us understand the problem. What is going on with this article?

dataclassでクラス変数を記述する

More than 1 year has passed since last update.

やり方

typingモジュールに、クラス変数であることを明示的に宣言する用の型が用意されているので、データクラスの作成時にクラス変数であることを明示して宣言すれば、initで用いられない。

from dataclasses import dataclass 
from typing import ClassVar

@dataclass
class TestClass:
    var1: ClassVar[str] = "class"
    var2: str = "instance"
$ TestClass(var1='var').var1
>>> TypeError: __init__() got an unexpected keyword argument 'var1'
$ TestClass(var2='var').var2
>>> 'var'

Reference

rarejob
明治神宮にあるオンライン英会話サービスを提供するベンチャー
https://www.rarejob.com/
Why not register and get more from Qiita?
  1. We will deliver articles that match you
    By following users and tags, you can catch up information on technical fields that you are interested in as a whole
  2. you can read useful information later efficiently
    By "stocking" the articles you like, you can search right away
Comments
No comments
Sign up for free and join this conversation.
If you already have a Qiita account
Why do not you register as a user and use Qiita more conveniently?
You need to log in to use this function. Qiita can be used more conveniently after logging in.
You seem to be reading articles frequently this month. Qiita can be used more conveniently after logging in.
  1. We will deliver articles that match you
    By following users and tags, you can catch up information on technical fields that you are interested in as a whole
  2. you can read useful information later efficiently
    By "stocking" the articles you like, you can search right away
ユーザーは見つかりませんでした