X = [[1,2,3],
[4 ,5,6],
[7 ,8,9]]

Y = [[9,8,7],
[6,5,4],
[3,2,1]]

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

# iterate through rows
for i in range(len(X)):
# iterate through columns
for j in range(len(X[0])):
result[i][j] = X[i][j] + Y[i][j]

for r in result:
print(r)

print('')

X = [[1, 2, 3],
[4, 5, 6],
[7, 8, 9]]

Y = [[9, 8, 7],
[6, 5, 4],
[3, 2, 1]]

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

print(r)

## Here is the code that is done in C#

Method 1:

This project adds two matrices together.  They must be the same dimensions.  Method 1 uses nested for statements.

X = [[1,2,3],[4 ,5,6],[7 ,8,9]]Y = [[9,8,7],[6,5,4],[3,2,1]]result = [[0,0,0],[0,0,0],[0,0,0]]# iterate through rowsfor i in range(len(X)):# iterate through columns   for j in range(len(X[0])):      result[i][j] = X[i][j] + Y[i][j]for r in result:print(r)
[10, 10, 10][10, 10, 10][10, 10, 10]

Method 2:
This combines the output with the nested for loops

X = [[1, 2, 3],[4, 5, 6],[7, 8, 9]]Y = [[9, 8, 7],[6, 5, 4],[3, 2, 1]]answer = [[X[i][j] + Y[i][j] for j in range(len(X[0]))] for i in range(len(X))]for r in answer:print(r)
[10, 10, 10][10, 10, 10][10, 10, 10]