Concurrently¶

Library helps to easily write concurrent executed code blocks.

Quick example:

import asyncio
from concurrently import concurrently


async def amain(loop):
    """
    How to fetch some web pages with concurrently.
    """
    urls = [  # define pages urls
        'http://test/page_1',
        'http://test/page_2',
        'http://test/page_3',
        'http://test/page_4',
    ]
    results = {}

    # immediately run wrapped function concurrent
    # in 2 thread (asyncio coroutines)
    @concurrently(2)
    async def fetch_urls():
        for url in urls:
            # some function for download page
            page = await fetch_page(url)
            results[url] = page

    # wait until all concurrent threads finished
    await fetch_urls()
    print(results)


if __name__ == '__main__':
    loop = asyncio.get_event_loop()
    loop.run_until_complete(amain(loop))

Decorator @concurrently() makes to main thinks:

starts concurrent execution specified count of decorated function
returns special Waiter object to control the running functions

By default, the code runs as asyncio coroutines, but there are other supported ways to execute, by specifying the argument engine.

Concurrently¶

Details¶