How to do accumulation in python

In Python, accumulation can be achieved using the function sum(),

Example:

numpy.sum(A)---all in the array Sum of elements, A---Array

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

Print

numpy.sum(A, axis=1)---The sum of all elements in the array and, the sum of the elements of a row with axis=1

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

Introduction to sum function:

Python’s own sum function (or sum function in Numpy),
When there are no parameters, add all;
axis=0, add by columns;
axis=1, add by rows;

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,)

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