原链：
https://charlesleifer.com/blog/asyncio/
Python async 感觉每过几年就要被人拿来否定下，这次是 Peewee 的作者，asyncio 和 Gevent 的项目我都经历过，感觉作者讲的挺有道理的：
Unlike asyncio, gevent transforms all the blocking calls in your application into non-blocking calls that yield control back to the event loop. As a result, you can continue to use the libraries you’re familiar with, and the exact same codebase can be run with or without gevent “enabled”
还好，社区这几年比较务实，在努力提升 Python 语言自身的性能。