How to find the average of a list in python?

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How to find the average of a list in python?

Python function method to find the average of a list:

Usage: mean(matrix,axis=0) where matrix is ​​a matrix and axis is a parameter

Take m * n matrix as an example:

axis does not set a value, averages m*n numbers, and returns a real number

axis=0: compress rows, each Calculate the average of the columns, return 1* n matrix

axis=1: compress the column, average each row, return m *1 matrix

>>>  import numpy as np
>>> num1 = np.array([[1,2,3],[2,3,4],[3,4,5],[4,5,6]])
>>> now2 = np.mat(num1)
>>> now2
matrix([[1, 2, 3],
        [2, 3, 4],
        [3, 4, 5],
        [4, 5, 6]])
>>> np.mean(now2) # 对所有元素求均值
3.5
>>> np.mean(now2,0) # 压缩行，对各列求均值
matrix([[ 2.5,  3.5,  4.5]])
>>> np.mean(now2,1) # 压缩列，对各行求均值
matrix([[ 2.],
        [ 3.],
        [ 4.],
        [ 5.]])

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