python中怎么求和

import numpy as np 

#python中自带的sum 

print(sum([[1,2,3],[4,5,5]])) 

print(sum([[1,2,3],[4,5,5]],axis=0)) 

print(sum([[1,2,3],[4,5,5]],axis=1)) 

#Numpy中的sum 

a = np.sum([[1,2,3], [4,5,5]]) #无参 

print(a) 

print(a.shape) 

a = np.sum([[1,2,3], [4,5,5]],axis=0) #axis=0, 按列相加 

print(a) 

print(a.shape) 

a = np.sum([[1,2,3], [4,5,5]],axis=1) #axis=1, 按行相加 

print(a) 

print(a.shape)

20

[5 7 8]

[ 6 14]

20

()

[5 7 8]

(3,)

[ 6 14]

(2,)