numpy中关于向量的坑

a = np.arange(6)
print("a = np.arange(6) out:\n", a)  # [ 0  1  2  3  4  5]
print("a.shape is", a.shape)  # (6,)
print("a.dim is", a.ndim)  # 1
aT = a.T
print("aT = a.T out:\n", aT)  # [ 0  1  2  3  4  5]
print("aT.shape is", aT.shape)  # (6,)
print("aT.dim is", aT.ndim)  # 1

b = np.arange(6).reshape(1, 6)
print("b = np.arange(6).reshape(1, 6) out:\n", b)  # [[0 1 2 3 4 5]]
print("b.shape is", b.shape)  # (1, 6)
print("b.dim is", b.ndim)  # 2
bT = b.T
print("bT = b.T out:\n", bT)
                                # [[0]
                                #  [1]
                                #  [2]
                                #  [3]
                                #  [4]
                                #  [5]]
print("bT.shape is", bT.shape)  # (6, 1)
print("bT.dim is", bT.ndim)  # 2