小结：
1、
python的妥协
2、
As we know, threads are a bad idea, (for most purposes). Threads make local reasoning difficult, and local reasoning is perhaps the most important thing in software development.
With the word “threads”, I am referring to shared-state multithreading, despite the fact that there are languages, like Erlang and Haskell which refer to concurrent processes – those which do not implicitly share state, and require explicit coordination – as “threads”.
https://glyph.twistedmatrix.com/2014/02/unyielding.html