asynchrony 0.2.0

Collection of utilities to write safe asyncio code.

asynchrony

Python asyncio framework for writing safe and fast concurrent code.

Features:

• Type annotated and type safe
• Makes it easy to work with cancellation, errors, and scheduling.
• Well tested and well documented.
• Zero dependency.
• Based on real world experience and pain.

Installation and usage

python3 -m pip install asynchrony

A simple example of starting concurrent tasks for all URLs (maximum 100 tasks at the same time) and waiting for all of them to finish:

from asynchrony import Tasks

async def download_page(url: str) -> bytes:
    ...

urls = [...]
tasks = Tasks[bytes](timeout=10, max_concurrency=100)
tasks.map(urls, download_page)

try:
    pages = await tasks
except Exception:
    failed = sum(t.failed for t in tasks)
    print(f'{failed} tasks failed')
    cancelled = sum(t.cancelled for t in tasks)
    print(f'{cancelled} tasks cancelled')
else:
    print(f'finished {len(tasks)} tasks')

See tutorial for runnable usage examples.