python3-concurrency. Python3爬虫系列的理论验证，首先研究I/O模型，分别用Python实现了blocking I/O、nonblocking I/O、I/O multiplexing各模型下的TCP服务端和客户端。然后，研究同步I/O操作（依序下载、多进程并发、多线程并发）和异步I/O（asyncio）之间的效率差别

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