[Python-ideas] .then execution of actions following a future's completion

Daniel Collins dancollins34 at gmail.com
Fri Jan 26 14:23:42 EST 2018

That’s very true. I’ll try to keep my terminology more in line with the implementation in the future.

The only problem with that, is that the function utilizes methods that are marked in the documentation as exclusively to be called by the executor (set_result, instantiation of future objects) and it would be confusing if a few lines later, a “but you can use them for this” example was provided.


Sent from my iPhone

> On Jan 26, 2018, at 1:05 PM, Guido van Rossum <guido at python.org> wrote:
>> On Fri, Jan 26, 2018 at 9:20 AM, Daniel Collins <dancollins34 at gmail.com> wrote:
>> @Guido As an aside, my understanding was libraries that fall back to c (Numpy as an example) release the GIL for load heavy operations. But I believe the explanation would hold in the general case if you replace thread with process using a ProcessPoolExecutor, that it would be good to be able to submit a callback function back to the executor.
> Sure, but your explanation didn't mention any of that.
> And yes, good catch on the last line of my example. :-)
> Given that the solution is only a few lines -- perhaps it's enough to just add it as an example to the docs, rather than to add it as a new function to concurrent.futures? A doc change can be added to 3.7!
> -- 
> --Guido van Rossum (python.org/~guido)
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