# 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 the console and print the sum of the matrix's 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:**

## Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:

**Python Code Editor:**

**Have another way to solve this solution? Contribute your code (and comments) through Disqus.**

**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.

**What is the difficulty level of this exercise?**

Test your Programming skills with w3resource's quiz.

## Python: Tips of the Day

**Given a predicate function, fn, and a prop string, this curried function will then take an object to inspect by calling the property and passing it to the predicate:**

Example:

def tips_check_prop(fn, prop): return lambda obj: fn(obj[prop]) check_age = tips_check_prop(lambda x: x >= 25, 'age') user = {'name': 'Owen', 'age': 25} print(check_age(user))

Output:

True

**Weekly Trends**- Java Basic Programming Exercises
- SQL Subqueries
- Adventureworks Database Exercises
- C# Sharp Basic Exercises
- SQL COUNT() with distinct
- JavaScript String Exercises
- JavaScript HTML Form Validation
- Java Collection Exercises
- SQL COUNT() function
- SQL Inner Join
- JavaScript functions Exercises
- Python Tutorial
- Python Array Exercises
- SQL Cross Join
- C# Sharp Array Exercises

We are closing our Disqus commenting system for some maintenanace issues. You may write to us at reach[at]yahoo[dot]com or visit us at Facebook