Author scoder
Recipients asvetlov, gvanrossum, ncoghlan, python-dev, scoder, vstinner, yselivanov
Date 2015-05-28.06:48:01
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Marked as misclassified Yes
Message-id <5566BA1F.7000001@behnel.de>
In-reply-to <1432785281.63.0.593517313764.issue24017@psf.upfronthosting.co.za>
Content
>> Yield-from iterates, and a coroutine is not supposed to be iterable, only awaitable (at least, that's what all error messages tell me when I try it). So why should "yield from" work on them? What if foo() was not an Iterable but a Coroutine? Should "yield from" then call "__await__" on it internally? I would find that *really* surprising, but given the above, I think it would be necessary to achieve consistency.
> 
> This is a special backwards-compatibility thing.

That only answers the half-serious first part of my question. ;)

This code only works if foo() returns an Iterable, including a (yield)
coroutine:

    @types.coroutine
    def bar():
        return (yield from foo())

It does not work for arbitrary Coroutines as they are not iterable, but it
might trick people into writing code that fails for non-coroutine
Coroutines. I'd rather like to have this either work for any Coroutine or
not at all.
History
Date User Action Args
2015-05-28 06:48:01scodersetrecipients: + scoder, gvanrossum, ncoghlan, vstinner, asvetlov, python-dev, yselivanov
2015-05-28 06:48:01scoderlinkissue24017 messages
2015-05-28 06:48:01scodercreate