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Static Method / Instance Method として呼び出されたときの挙動を変える

Posted at

どうすれば良いか

self に初期値を設定してあげると、インスタンス関数をクラスから呼び出したときもエラーが出なくなる。

.py
from typing import Self


class A():
    def A(self: Self | None = None):
        if self is None:
            print("I am static method A")
        else:
            print("I am instance method A")


A.A()
# >>> I am static method A

A().A()
# >>> I am instance method A

便利だと思うか、分かりにくいと思うかはあなた次第。

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