関連ワード:  how to define an 2d array in python    how to initialize an 2d array in python    how to declare an 2d array in python    how to define an empty 2d array in python    how to define a 2d array in python using numpy    how to initialize an empty 2d array in python    how to define multidimensional array in python    how to declare 2 d array in python    how to initialize 2d array in python with 0    how to set 2d array in python