Python Coding challenge - Day 727| What is the output of the following Python Code?

 

Code Explanation:

1. Importing the asyncio module

import asyncio

The asyncio library is used for asynchronous programming in Python.

It allows us to run multiple tasks concurrently without creating multiple threads.

2. Defining an async function

async def f(x):

    return x * 2

async def defines an asynchronous function (coroutine).

f(x) takes an argument x and returns x * 2.

Since there’s no await inside, it just wraps a normal computation in an async function.

3. Defining the main coroutine

async def main():

    res = await asyncio.gather(f(2), f(3), f(4))

    print(res)

main() is another async function.

Inside it, we use:

asyncio.gather() → runs multiple coroutines concurrently.

Here, it runs f(2), f(3), and f(4) at the same time.

Each call will return 2 * 2 = 4, 3 * 2 = 6, and 4 * 2 = 8.

The result is collected in a list: [4, 6, 8].

print(res) outputs the result.

4. Running the main coroutine

asyncio.run(main())

This is the entry point for running async code.

asyncio.run() starts the event loop and runs the main() coroutine until it finishes.

Final Output:

[4, 6, 8]

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