题解 | #牛牛的矩阵乘法#

x_list = [[13,-1,4],[5,0,6],[1,9,-3]]
'''
for i in range(len(y_list)):
    for j in range(len(y_list[i])):
        y_list[i][j] += 1
'''
new_list = []

for i in range(len(x_list)):
    row_list = list()
    for j in range(len(x_list[i])):
        value = 0
        for k in range(len(x_list[i])):    
            value += x_list[i][k] * y_list[k][j]
        row_list.append(value)
    new_list.append(row_list)
        
print(new_list)