Matrix Multiplication in Python

#matrix multiplication in Python

x=[[2,7,3],[3,5,6],[4,8,9]]
y=[[5,8,1,2],[6,7,3,0],[4,5,9,1]]
r=[[0,0,0,0],[0,0,0,0],[0,0,0,0]]

#iterate through rows
for i in range(len(x)):
    for j in range(len(y[0])):
        for k in range(len(y)):
            r[i][j]+=x[i][k]*y[k][j]


for k in r:
    print(k)