関連ワード:  how to do 2d array python    how to make 2d array python    how to make 2d matrix python    how to create 2d array in python using numpy    how to create empty 2d array python    how to make 2d array in python numpy    how to get 2d array in python    how to take 2d array in python    how to take 2d array input in python    how to get length of 2d array python