# Python: Read a square matrix from console and print the sum of matrix primary diagonal

## Python List: Exercise - 88 with Solution

Write a Python program to read a square matrix from console and print the sum of matrix primary diagonal. Accept the size of the square matrix and elements for each column separated with a space (for every row) as input from the user.

**Sample Solution**:

**Python Code:**

```
size = int(input("Input the size of the matrix: "))
matrix = [[0] * size for row in range(0, size)]
for x in range(0, size):
line = list(map(int, input().split()))
for y in range(0, size):
matrix[x][y] = line[y]
matrix_sum_diagonal = sum(matrix[size - i - 1][size - i - 1] for i in range(size))
print("Sum of matrix primary diagonal:")
print(matrix_sum_diagonal)
```

Sample Output:

Input the size of the matrix: 3 2 3 4 4 5 6 3 4 7 Sum of matrix primary diagonal: 14

**Pictorial Presentation: **

**Flowchart:**

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**Previous:** Write a Python program to read a matrix from console and print the sum for each column. Accept matrix rows, columns and elements for each column separated with a space(for every row) as input from the user.

**Next:** Write a Python program to Zip two given lists of lists.

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## Python: Tips of the Day

**Big Number Readability:**

you can separate zeros with underscore (_)

print(2_000_000) print(2_000_000 +1)

Output:

2000000 2000001

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