[Python-ideas] gevent-like Coroutines in Python

Ron Reiter ron.reiter at gmail.com
Tue Oct 30 08:35:53 EDT 2018

You are right that they are different, I was actually assuming that
developers by default don't try to parallelize and would rather go ahead
and write code to yield one function at a time, which is fine. The need to
separate "await" from the invocation is something which is rarely used. Not
sure what you mean about "threading" as it is still more efficient and
lightweight to parallelize workers on an event loop rather than using
blocking threads.

As I said - I don't think we should downgrade Python's current ability to
do so, my suggestion is to create something like the "codef" proposal,
which will also await on every function invocation - for readability.

- Ron

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On Tue, Oct 30, 2018 at 12:41 PM Chris Angelico <rosuav at gmail.com> wrote:

> On Tue, Oct 30, 2018 at 6:01 PM Ron Reiter <ron.reiter at gmail.com> wrote:
> >
> > ... most developers would always mean they prefer to do this:
> >
> > result = [await fun(x) for fun in funcs]
> >
> > versus:
> >
> > result = [fun(x) for fun in funcs]
> > await asyncio.gather(*result)
> >
> > Moreso, having it become the default makes statements like this:
> >
> > result = [await fun(x) for fun in funcs if await smth]
> >
> > Look like this:
> >
> > result = [fun(x) for fun in funcs if smth]
> >
> > Therefore, my suggestion is to create a new "async" definition which
> basically turns every function invocation into an "await" if a generator is
> returned.
> >
> I'm not sure what you're driving at here. From your first example, I
> gather that (pun intended) you're expecting the 'result' list to
> contain all the results from the different function calls, running
> them all in parallel; but your second example and described suggestion
> seem to imply that the waitings would continue to be sequential.
> Unless you're asking for straight-up magic ("do everything in parallel
> unless they need to be serialized"), there still needs to be a clear
> way to differentiate between "wait for this right now and give me a
> result before this function continues" and "gather all these jobs
> together, get me the results, and then move on once you have them
> all". It might perhaps be nice to have an easier/more obvious syntax
> for gather(), but it definitely needs to have some form of spelling.
> If you're not asking for them to be run in parallel, you're asking for
> an implicit way for a function call to block its caller, and for the
> calling function to act sequentially. Python already has that - it's
> called threading :)
> ChrisA
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