asyncio.gather in Python

Running many coroutines concurrently and collecting results.

import asyncio


async def fetch(name, delay):
    await asyncio.sleep(delay)
    return f"{name}: done"


async def main():
    results = await asyncio.gather(
        fetch("users", 0.3),
        fetch("posts", 0.2),
        fetch("stats", 0.1),
    )
    return results  # all three ran concurrently


answers = asyncio.run(main())

How it works

gather schedules all three fetches at once.
They overlap, so total time is the slowest, not the sum.
Results come back in call order.

Keywords and builtins used here

async
await
def
fetch
main
return

The run, in numbers

Lines: 18
Characters to type: 290
Tokens: 80
Three-star pace: 105 tpm

At the three-star pace of 105 tokens a minute, this run takes about 46 seconds.

Type this snippet

Step 2 of 4 in Async, step 25 of 53 in Pythonic Python.

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