问题 I have two arrays: A = np.array([1, 2, 3]) B = np.array([2, 3, 4]) C = np.stack((A, B), axis=0) print C.shape (2, 3) Shouldn't the shape be (6,) ? 回答1: Using the np.stack() function you can specify which axis would you like to be considered the index axis. So as you can see you will never get a shape of 6 , only (2,3) or (3,2) for this example depending on what axis you chose. See below: A = np.array([1, 2, 3]) B = np.array([2, 3, 4]) arrays = [A, B] With this code: print(np.stack(arrays,