1. import numpy as np
    2. a = np.array([[1,2,3,4],[5,6,7,8]])
    3. a[0:1,2:3] # 连续索引
    4. Out[10]: array([[3]])
    5. a[0:2,1:3]
    6. Out[11]: 
    7. array([[2, 3],
    8.        [6, 7]])