a = np.array([[1, 2, 3], [2, 3, 2]]) print(a.shape)
out:
(2, 3)
a = np.array([[1, 2, 3]]) print(a.shape)
(1, 3) #1行3列，a.shape[0] = 1
a = np.array([1, 2, 3]) print(a.shape)
out: (3,)
这里是引用
以上三种类型均为<class ‘numpy.ndarray’>
