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async-busy-wait (ASYNC110)

Added in 0.5.0 · Related issues · View source

Derived from the flake8-async linter.

What it does

Checks for the use of an async sleep function in a while loop.

Why is this bad?

Instead of sleeping in a while loop, and waiting for a condition to become true, it's preferable to await on an Event object such as: asyncio.Event, trio.Event, or anyio.Event.

Example

import asyncio

DONE = False


async def func():
    while not DONE:
        await asyncio.sleep(1)

Use instead:

import asyncio

DONE = asyncio.Event()


async def func():
    await DONE.wait()

References