np.cumsum()

import numpy as np
a = np.cumsum([[1,2],[2,3]])
print(a)#[1 3 5 8],由前面的值依次累加
b = np.cumsum([[1,2],[2,3]],axis=0)
print(b)
#[[1 2]
# [3 5]]
#每列累加


c = np.cumsum([[1,2],[2,3]],axis=1)
print(c)
#[[1 3]
# [2 5]]
#每行累加