python 3でのnumpyの使用

import numpy as np

#           
observations = np.array([[1, 0, 0, 0, 1, 1, 0, 1, 0, 1],
                         [1, 1, 1, 1, 0, 1, 1, 1, 1, 1],
                         [1, 0, 1, 1, 1, 1, 1, 0, 1, 1],
                         [1, 0, 1, 0, 0, 0, 1, 1, 0, 0],
                         [0, 1, 1, 1, 0, 1, 1, 1, 0, 1]])
for observation in observations:
    print(observation)#     
    print(observation.sum())#     
    print(len(observation))