関連ワード:  how to make a np array in python    how to make a numpy array in python    how to create a np array in python    how to make a 2d numpy array in python    how to create a multidimensional numpy array in python    how to make an empty np array in python    how to get the length of a numpy array in python    how to get the size of a numpy array in python    how to create a numpy array from a python list    how to make a 2d array in python using numpy