- https://docs.python.org/3/library/asyncio.html
- https://lucumr.pocoo.org/2016/10/30/i-dont-understand-asyncio/ https://news.ycombinator.com/item?id=12829759
- https://calpaterson.com/async-python-is-not-faster.html https://news.ycombinator.com/item?id=23496994
Crawler: https://github.com/mCodingLLC/VideosSampleCode/blob/master/videos/117_hello_async/crawl.py#L130
https://github.com/mCodingLLC/VideosSampleCode