[issue29423] using concurrent.futures.ProcessPoolExecutor in class giving 'TypeError: can't pickle _thread.RLock objects' in 3.6, but not 3.5

[spencera]

spencera added the comment:

Interesting. So, out of curiosity, what has changed from 3.5.2 to 3.6.0 that causes this new behavior? Was an instance associated with an instance method that was passed to submit not implicitly pickled before 3.6.0? Is it from the changes to the pickle module in 3.6? Something else?

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<http://bugs.python.org/issue29423>
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