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Thu Nov 23 06:38:31 EST 2017 · https://mail.python.org/pipermail/python-dev/2017-November/150761.html

On 23 November 2017 at 11:55, Nick Coghlan <ncoghlan at gmail.com> wrote:

> On 23 November 2017 at 18:11, Greg Ewing <greg.ewing at canterbury.ac.nz>
> wrote:
>
>> Ivan Levkivskyi wrote:
>>
>>> "People sometimes want to refactor for-loops containing `yield` into a
>>> comprehension but that doesn't work (particularly because of the hidden
>>> function scope) - lets make it a SyntaxError"
>>>
>>
>> Personally I'd be fine with removing the implicit function
>> scope from comprehensions and allowing yield in them, since
>> the semantics of that are clear.
>>
>
> People keep saying this, but seriously, those semantics aren't clear at
> all once you actually start trying to implement it.
>
>
If Serhiy will implement his idea (emitting for-loop bytecode inside a
try-finally), then I see no problems accepting it as a fix.

--
Ivan
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[Python-Dev] Tricky way of of creating a generator via a comprehension expression