Ma Lin <malin...@163.com> added the comment:

These can be done in .__new__() method:
- create thread lock
- create (de)?compression context
- initialize (de)?compressor states

In .__init__() method, only set (de)?compression parameters. And prevent 
.__init__() method from being called multiple times. 

This mode works fine in my pyzstd module (A Python bindings to zstd library).
But I think very few people will encounter this problem, we can leave it.

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nosy: +malin

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<https://bugs.python.org/issue23224>
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