Python Coding challenge - Day 751| What is the output of the following Python Code?

 

Code Explanation:

1. Import the asyncio module

import asyncio

Imports Python’s built-in asynchronous I/O library.

It lets us run async functions concurrently (without threads).

2. Define an async function

async def f(x):

    return x + 2

async def defines a coroutine (special function).

Takes input x and returns x + 2.

Example: f(1) returns 3, f(2) returns 4.

3. Define the main coroutine

async def main():

    res = await asyncio.gather(f(1), f(2), f(3))

    print(sum(res))

async def main() is the entry coroutine.

Inside it:

asyncio.gather(f(1), f(2), f(3)) runs all three coroutines concurrently.

It collects results into a list: [3, 4, 5].

await pauses main() until all tasks finish.

sum(res) = 3 + 4 + 5 = 12.

4. Run the event loop

asyncio.run(main())

Starts the event loop and executes main().

Runs until all async tasks inside main() are complete.

Final Output

12

500 Days Python Coding Challenges with Explanation