関連ワード:  how to use abstract classes in python    how to implement abstract classes in python    how to use abstract base class in python    how to abstract class in python    how to create abstract classes in python    how to define abstract classes in python    how to name abstract classes in python    how to import abstract class in python    how to declare abstract class in python    how to write abstract class in python  
結果 : how to use abstract classes in python