Fluent Python : clear concise and effective programming [PDF]

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Fluent Python : clear concise and effective programming – Book

Note that most functionality of the old download_many function is now in a coroutine, downloader_coro. This was necessary because we must use yield from to retrieve the results of the futures yielded by asyncio.as_completed, therefore as_completed must be invoked in a coroutine.

However, I couldn’t simply turn download_many into a coroutine, because I must pass it to the main function from flags2_common in the last line of the script, and that main function is not expecting a coroutine, just a plain function. Therefore I created down loader_coro to run the as_completed loop, and now download_many simply sets up the event loop and schedules downloader_coro by passing it to loop.run_until_com plete.