関連ワード:  how to create a np array in python    how to create a numpy array in python    how to create a 2d numpy array in python    how to create a multidimensional numpy array in python    how to create empty numpy array in python    how to create a numpy array from a python list    how to create an empty 2d numpy array in python    how to create a 2d array in python using numpy    how to create array in python using numpy    how to create array in python without numpy