async — Intermediate Playground

Declares an asynchronous coroutine function or context manager

Python Playground

import asyncio

async def task(name, delay):
    print(f"  {name}: starting")
    await asyncio.sleep(delay)
    print(f"  {name}: done after {delay}s")
    return f"{name}-result"

async def main():
    # Run tasks concurrently with gather
    results = await asyncio.gather(
        task("A", 0.02),
        task("B", 0.01),
        task("C", 0.03),
    )
    print(f"Results: {results}")

asyncio.run(main())

Output

Click "Run" to execute your code

asyncio.gather() runs multiple coroutines concurrently. Unlike threads, async switches tasks at await points, not preemptively.

Challenge

Try modifying the code above to explore different behaviors. Can you extend the example to handle a new use case?

View all Intermediate examples for async