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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