[Python-ideas] Cofunctions - an enhancement to yield-from

Antoine Pitrou solipsis at pitrou.net
Mon Aug 2 02:16:36 CEST 2010

On Mon, 02 Aug 2010 12:07:06 +1200
Greg Ewing <greg.ewing at canterbury.ac.nz> wrote:
> There are still use cases for
> 'yield from', when you're dealing with generators that are
> designed to produce values.

It was the tree-walking example, right? It really looked like it solved
a non-existing problem.

> > From an outsider's view (mine :-)), I think this alternative makes
> > more sense than trying to stretch the generator protocol far beyond
> > what it was designed for at the start. It would also clearly
> > separate the two use cases of generative iteration and coroutines.
> Well, that's one way of looking at it. Another is that generators
> and coroutines are such closely related concepts that it would
> seem odd not to be able to define one in terms of the other,
> or both in terms of some unifying construct.

Well, it sounds like saying classes and functions are closely related
concepts because both denote callable objects.
I think there is value in clearly distinguished concepts, rather than
some intellectually appealing over-generalization (what Joel Spolsky
calls Architecture Astronauts).



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