On Jan 26, 2017, at 1:45 AM, Craig Rodrigues <rodrigc@crodrigues.org> wrote:

On Wed, Jan 25, 2017 at 10:06 AM, Phil Mayers <p.mayers@imperial.ac.uk> wrote:

Related, see:

http://stackoverflow.com/questions/32139885/yield-in-list-comprehensions-and-generator-expressions

http://bugs.python.org/issue10544

Basically, don't use yield inside comprehensions if you don't want weirdness, AFAICT :o/

Yes, that's the exact issue!
Pointed out to me on the python-dev list:

https://mail.python.org/pipermail/python-dev/2017-January/147242.html

My vote is that this is a bug in Python.

Discussing on that bug, I discovered that this is sort-of fixed in python 3.6; not for generators, but for coroutines. You can have an 'async def' function that does 'await' inside a generator and it should work.