Re: [Python-ideas] Yield-From: Finalization guarantees

Nick Coghlan wrote:

That makes perfect sense to me as a justification for treating GeneratorExit the same as any other exception (i.e. delegating it to the subgenerator). It doesn't lead me to think that the semantics ever need to involve calling close().

I'm also treating close() and throw(GeneratorExit) on the delegating generator as equivalent for finalization purposes. So if throw(GeneratorExit) doesn't fall back to close() on the subiterator, closing the delegating generator won't finalize the subiterator unless it pretends to be a generator by implementing throw(). Since the inlining principle strictly only applies to subgenerators, it doesn't *require* this behaviour, but to my mind it strongly suggests it. -- Greg