Python Coding challenge - Day 432| What is the output of the following Python Code?

 

import asyncio

This imports Python's asynchronous I/O library.

The asyncio module provides tools for writing concurrent code using async/await syntax.

You’ll use it to run asynchronous functions (coroutines).

async def a(): return 1

This defines an asynchronous function (coroutine) named a.

The async def syntax marks this as a coroutine.

When called, it returns a coroutine object, not the value 1 immediately.

Inside, it just returns 1.

async def b(): return await a()

This defines another coroutine b.

Inside it, await a() is used, meaning:

It calls the coroutine a() and waits for it to finish.

It pauses execution until a() completes and returns 1.

Then b() returns that result.

async def c(): return await b()

This is a third coroutine c.

It does the same thing: awaits b(), which awaits a(), which returns 1.

So this creates a simple chain of async calls: c() → b() → a() → 1.

print(asyncio.run(c()))

asyncio.run() is used to run the coroutine c() from synchronous code (like a script).

It:

Starts an event loop.

Runs c() until it completes.

Returns the final result.

So here, it executes c() → b() → a() → returns 1.

That 1 is printed.

Final Output:

1