関連ワード:  how to make 2d arrays python    how to make 2d list python    how to do 2d arrays python    how to make 2d matrix python    how to create 2d array python    how to make 2d array in python numpy    how to make empty 2d array python    how to make empty 2d list python    how to create 2d array in python using numpy    how to make multidimensional array in python