関連ワード:  how do you create classes in python    how do you create object in python    how do you create a class in python with example    how do you create a class object in python    how do you create an abstract class in python    how do you make a class in python    how do you create a class method in python    how do you create a class variable in python    how do you create an instance of class in python    how do you create a custom exception class in python