python中累加怎么做

import numpy as np
a = np.array([[1,3,6],[9,5,6]])
b = np.sum(a)
print(b)

import numpy as np
a = np.array([[1,3,6],[9,5,6]])
b = np.sum(a , axis=1)
print(b)

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,)