﻿ Python: Read a matrix from console and print the sum for each column - w3resource

# Python: Read a matrix from console and print the sum for each column

## Python List: Exercise - 87 with Solution

Write a Python program to read a matrix from the console and print the sum for each column. As input from the user, accept matrix rows, columns, and elements separated by a space (each row).

Visual Presentation:

Sample Solution:

Python Code:

``````# Prompt the user to input the number of rows for the matrix
rows = int(input("Input rows: "))

# Prompt the user to input the number of columns for the matrix
columns = int(input("Input columns: "))

# Create a 2D matrix filled with zeros using list comprehensions based on the number of rows and columns
matrix = [[0]*columns for row in range(rows)]

# Prompt the user to input the elements for each row in the matrix
print('Input number of elements in a row (1, 2, 3): ')
for row in range(rows):
# Read a line of space-separated integers and convert them to a list of integers
lines = list(map(int, input().split()))
for column in range(columns):
# Populate the matrix with the input elements
matrix[row][column] = lines[column]

# Create a list 'sum' initialized with zeros to store the sum for each column
sum = [0]*columns

# Print a message indicating the calculation of the sum for each column
print("Sum for each column:")

# Iterate over each column
for column in range(columns):
# Calculate the sum of the elements in the current column by iterating through the rows
for row in range(rows):
sum[column] += matrix[row][column]

# Print the sum for the current column followed by a space
print((sum[column]), ' ', end = '')
```
```

Sample Output:

```Input rows:  2
Input columns:  2
Input number of elements in a row (1, 2, 3):
1 2
3 4
sum for each column:
4  6
```

Flowchart:

Python Code Editor:

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.

﻿