Python Coding challenge - Day 639| What is the output of the following Python Code?

 Code Explanation:

1. Importing Modules

import csv

from io import StringIO

import csv: Imports Python’s built-in csv module, which provides tools to read from and write to CSV (Comma-Separated Values) files.

from io import StringIO: Imports StringIO from the io module. StringIO lets you treat a string as a file-like object (like a file in memory). Useful for simulating a file without actually creating one.

2. Defining the get_ages Function

def get_ages():

This defines a function named get_ages. It will return a generator that yields the ages (as integers) from the CSV data.

3. Simulating a CSV File with StringIO

    data = StringIO("name,age\nAnn,22\nBen,30")

StringIO("name,age\nAnn,22\nBen,30") creates an in-memory file-like object containing this CSV content:

name,age

Ann,22

Ben,30

This simulates a CSV file with two rows of data after the header.

4. Reading the CSV Data

    reader = csv.DictReader(data)

csv.DictReader(data) reads the CSV content.

It parses each row as a dictionary using the header row (name, age) as the keys.

First row: {'name': 'Ann', 'age': '22'}

Second row: {'name': 'Ben', 'age': '30'}

5. Returning a Generator of Ages

    return (int(row['age']) for row in reader)

This line creates and returns a generator expression that:

Iterates over each row in the reader.

Extracts the 'age' value from each row.

Converts it from a string to an integer using int().

So, it will generate: 22, then 30.

6. Using the Generator in sum()

print(sum(get_ages()))

get_ages() returns the generator.

sum(...) adds up all the numbers yielded by the generator.

print(...) outputs the result.

So, it prints: 22 + 30 = 52

Final Output

52

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