X = [[12,7,3], 
[4 ,5,6],
[7 ,8,9]]

Y = [[5,8,1],
[6,7,3],
[4,5,9]]

result = [[0,0,0],
[0,0,0],
[0,0,0]]

# iterate through rows
for i in range(len(X)):

   for j in range(len(X[0])):
              result[i][j] = X[i][j] + Y[i][j]

for r in result:
      print(r)
Вывод результата:
[17, 15, 4] 
[10, 12, 9]
[11, 13, 18]


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