関連ワード:  how to use 2d list in python    how to access 2d list in python    how to access 2d list elements in python    how to take 2d list input in python    how to 2d list in python    how to create 2d list in python    how to make 2d list in python    how to initialize 2d list in python    how to declare 2d list in python    how to sort 2d list in python