関連ワード:  how to make a numpy array in python    how to create a np array in python    how to make 2d numpy array in python    how to create a multidimensional numpy array in python    how to make an empty numpy 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    how to create an empty 2d numpy array in python