二维数组行总和

Question

我在 python 中有一个二维数组，我试图在行中添加值，但我只从最后一个一维数组中得到总和。

代码：

def sum_row(A,n):
    for i in range(len(A)):
        s = 0
        for j in range(len(A[i])):
            s = A[i].sum()
    return s

预期结果：

A =
 [[3 6 6 0 9 8]
 [4 7 0 0 7 1]
 [5 7 0 1 4 6]
 [2 9 9 9 9 1]]
sum of row 0 = 32
sum of row 1 = 19
sum of row 2 = 23
sum of row 3 = 39

结果：

A = 
 [[3 6 6 0 9 8]
 [4 7 0 0 7 1]
 [5 7 0 1 4 6]
 [2 9 9 9 9 1]]
sum of row 0 = 39
sum of row 1 = 39
sum of row 2 = 39
sum of row 3 = 39

Answer 1

使用map迭代并创建sum ：

a = [[1,1], [2,2]]
out = list(map(lambda row:sum(row) ,a))