関連ワード:  how to make a empty array in python    how to make an empty array in python numpy    how to create an empty array in python of size n    how to make empty 2d array in python    how to create a new empty array in python    how to make an empty np array in python    how to create an empty 3d array in python    how to create an empty multidimensional array in python    how to create an empty string array in python    how to create an empty 2 dimensional array in python