Adding and sorting row of matrices in python

Question

The program below generates a random matrix, according to the amount of lines desired.

def gerar(nLins, nCols, min, max):
    from random import randint
    vals = [None] * nLins
    for i in range(nLins):
        vals[i] = [0] * nCols
        for j in range(nCols):
            vals[i][j] = randint(min, max)
    return vals


def mostrar(vals, linMin, linMax, colMin, colMax):
    for i in range(linMin, linMax):
        for j in range(colMin, colMax):
            print(vals[i][j], end=" ")
        print()
    print()
    return None




qtd = input().split()
qtdLinhas = int(qtd[0])
qtdColunas = int(qtd[1])
valores = gerar(qtdLinhas, qtdColunas, 10, 99)
mostrar(valores, 0, qtdLinhas, 0, qtdColunas)

In this case, I would like to know how I could sum each row of the matrix and generate a new matrix with the rows of the matrix in ascending order of the sum of its values?

Example:

I want a 5 x 6 matrix

The matrix is generated:

13 28 45 50 26 10
27 24 22 33 88 11
90 25 85 23 76 55
77 15 31 29 13 14
66 41 50 20 47 11

With it, the second matrix is generated with the ordered lines according to their sum, in ascending order:

13 28 45 50 26 10 
77 15 31 29 13 14 
27 24 22 33 88 11 
66 41 50 20 47 11 
90 25 85 23 76 55 

Since their sums in ascending order give 172 in the first line, 179 in the second line, 205 in the third line, and so on...

Answer 1

Use the method sort.

You can pass in the parameter key a callback function to generate the value that will be used to compare and organize matrix items. For this case just use the function sum to sum up all the items on each list. The results of the sums will be compared internally and the matrix will be organized in ascending order by the results of the sums:

valores = [
    [13, 28, 45, 50, 26, 10],
    [27, 24, 22, 33, 88, 11],
    [90, 25, 85, 23, 76, 55],
    [77, 15, 31, 29, 13, 14],
    [66, 41, 50, 20, 47, 11]
]

valores.sort(key=sum)