関連ワード:  how to define an empty list python    how to initialize an empty list python    how to declare an empty list python    how to set an empty list in python    how to assign an empty list in python    how to generate an empty list in python    how to define an empty 2d list in python    how to initialize an empty 2d list in python    how to set up an empty list in python    how to initialize an empty linked list in python