Python Coding challenge - Day 436| What is the output of the following Python Code?

 

Code Explanation:

1. Importing the asyncio Module

import asyncio

asyncio is Python’s built-in library for writing asynchronous code using the async/await syntax.

It's used for tasks like concurrent I/O operations (e.g., network requests, file reads).

2. Defining an Asynchronous Function f

async def f(x):

    return x * 2

This is an async function, meaning it returns a coroutine.

It takes an input x and returns x * 2.

Because there's no await inside, it's very fast and technically doesn't need to be async—but it's used here for demonstration or compatibility with other async code.

3. Defining the main Coroutine

async def main():

    r = await asyncio.gather(f(2), f(3))

    print(r)

This is another coroutine.

asyncio.gather(f(2), f(3)) runs both f(2) and f(3) concurrently.

await waits until both coroutines finish and returns their results as a list.

The result is printed: [4, 6].

4. Running the Event Loop

asyncio.run(main())

This starts the async event loop and runs the main() coroutine.

It blocks until main() is finished.

Final Output

[4, 6]