Python Coding challenge - Day 617| What is the output of the following Python Code?

 

Code Explanation:

1. Importing the json Module

import json

Imports Python’s built-in json module.

This module allows you to parse JSON-formatted strings into Python objects (like lists and dictionaries).

2. JSON String as Input

data = '[{"a": 1}, {"a": 2}, {"a": 3}]'

data is a JSON-formatted string representing a list of dictionaries.

Each dictionary has a single key "a" with an integer value.

Equivalent Python object after parsing:

[{"a": 1}, {"a": 2}, {"a": 3}]

3. Defining the Generator Function

def extract_values(json_str):

This defines a function named extract_values that takes a JSON string as input.

It will yield (generate) values from the key 'a' in each dictionary.

4. Parsing and Iterating Over JSON Data

    for obj in json.loads(json_str):

json.loads(json_str) converts the JSON string into a Python list of dictionaries.

The loop iterates over each dictionary (obj) in that list.

5. Yielding Values from Key 'a'

        yield obj['a']

For each dictionary in the list, the function yields the value associated with the key 'a'.

So this yields: 1, then 2, then 3.

6. Calling the Function and Summing the Values

print(sum(extract_values(data)))

extract_values(data) returns a generator that yields 1, 2, 3.

sum(...) calculates the total sum of these values:

1 + 2 + 3 = 6

print(...) displays the result.

Output:

6

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