関連ワード:  what is classmethod in python    what is @classmethod in python class    what is class method in python with example    what is @classmethod decorator in python    what is @classmethod and @staticmethod in python    what is static and class method in python    what is the use of @classmethod in python    what is the use of class method in python    what is instance method and class method in python    what is the purpose of class method in python