﻿ Python: Read a square matrix from console and print the sum of matrix primary diagonal - w3resource

# 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 = [ * 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
```

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## 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
```

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