関連ワード:  how to append a class in python    how to add a class in python    how to add a class variable in python    how to append class object in python    how to add methods to a class in python    how to add attributes to a class in python    how to add something to a class in python    how to append to a list in a class in python    how to append a class object to a list in python    how to add two classes in python