On Wed, Aug 30, 2017 at 2:36 AM, Greg Ewing <greg.ew...@canterbury.ac.nz> wrote:
> Yury Selivanov wrote: > >> While we want "yield from" to have semantics close to a function call, >> > > That's not what I said! I said that "yield from foo()" should > have semantics close to a function call. If you separate the > "yield from" from the "foo()", then of course you can get > different behaviours. > > But that's beside the point, because I'm not suggesting > that generators should behave differently depending on when > or if you use "yield from" on them. > > For (1) we want the context change to be isolated. For (2) you say >> that the context change should propagate to the caller. >> > > No, I'm saying that the context change should *always* > propagate to the caller, unless you do something explicit > within the generator to prevent it. > > I have some ideas on what that something might be, which > I'll post later. > > FYI, I've been sketching an alternative solution that addresses these kinds of things. I've been hesitant to post about it, partly because of the PEP550-based workarounds that Nick, Nathaniel, Yury etc. have been describing, and partly because that might be a major distraction from other useful discussions, especially because I wasn't completely sure yet about whether my approach has some fatal flaw compared to PEP 550 ;). —Koos -- + Koos Zevenhoven + http://twitter.com/k7hoven +
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