関連ワード:  how to make 2d lists in python    how to do 2d lists in python    how to make two dimensional list in python    how to make empty 2d list in python    how to get size of 2d list in python    how to get length of 2d list in python    how to make a copy of a 2d list in python    how to make 2d list to 1d list python    how do 2d lists work in python    how do you make a 2d list in python