[Python-ideas] Add `n_threads` argument to `concurrent.futures.ProcessPoolExecutor`

[Ram Rachum]

Hi,

I'd like to use `concurrent.futures.ProcessPoolExecutor` but have each 
process contain multiple worker threads. We could have an `n_threads` 
argument to the constructor, defaulting to 1 to maintain backward 
compatibility, and setting a value higher than 1 would cause multiple 
threads to be spawned in each process.

What do you think? 


Ram.
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