[Python-ideas] Cofunctions - Back to Basics

[Nick Coghlan]

On Thu, Oct 27, 2011 at 10:19 PM, Steven D'Aprano <steve at pearwood.info> wrote:
> The Cofunction Definitions section does not help me understand the concept
> at all:
>
> (1) You state that it is a "special kind of generator", but don't give any
> clue as to how it is special. Does it do something other generators can't
> do? A cofunction is spelled 'codef' instead of 'def', but what difference
> does that make to the behaviour of the generator you get? How does it behave
> differently to other generators?
>
> (2) Cofunctions, apparently, "may" contain yield or yield from. Presumably
> that means that yield is optional, otherwise it would be "must" rather than
> "may". So what sort of generator do you get without a yield? The PEP doesn't
> give me any clue.

Yeah, there need to be more references to big motivating use
cases/examples of what people are already doing in this space (i.e.
Twisted, greenlet, gevent) and how the PEP helps us move towards
making asynchronous I/O with an event loop as easy to use as blocking
I/O (with or without threads).

Cheers,
Nick.

-- 
Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia