Python矩阵乘法整数使用用于循环

Question

from numpy import linalg
from numpy import matmul



A = [[1,2],[2,3]]
b = [[5],[2]
Ab = [] 

nrows = 2
ncols = 2
for i in range(0,nrows):
    sum = 0
    for j in range(0,ncols):
        sum = sum + A[i][j] * b[j][0]
    Ab[?] = ?  

print(Ab)

exit()

我不确定该提出的问题标记为“ ab [？] =？”。我尝试了“ ab [i] = sum”，但这似乎不起作用。我需要此代码来打印A和b中列出的乘以矩阵的结果。 行是“ sum = sum + a [i] [j] * b [j] [0]“对吗？