関連ワード:  how to make an np array in python    how to make an numpy array in python    how to make an empty numpy array in python    how to make 2d numpy array in python    how to create an empty 2d numpy array in python    how to make an array in python using numpy    how to make an array in python without numpy    how to get size of numpy array in python    how to get length of numpy array in python    how to create a multidimensional numpy array in python