Python 3.5.2/3.6+ compatibility patch for async generator protocol change

[achimnol]

Long story short

Currently the code uses PY_35 flag to define async generators (__aiter__ and __anext__ methods). However, __aiter__ will be changed to a plain method instead of coroutine in the future Python versions starting from Python 3.5.2 (http://bugs.python.org/issue27243).
Though it will follow the standard deprecation process and the code would not break immediately with deprecation warnings, I think we should be aware of this issue.

Expected/Actual behaviour

In all places that define __aiter__ method, it should check also not only if the current version >= 3.5.0 but also 3.5.2.

if PY_35:
    @asyncio.coroutine
    def __aiter___(self):
        ...

    @asyncio.coroutine
    def __anext__(self):
        ...

should become:

if PY_350 or PY_351:  # may need to be cleaned up
    @asyncio.coroutine
    def __aiter___(self):
        return self

    @asyncio.coroutine
    def __anext__(self):
        ...
elif PY_352:
    def __aiter___(self):
        return self

    @asyncio.coroutine
    def __anext__(self):
        ...

Your environment

Python 3.5.2 on MacOS X.

[asvetlov]

Good catch!

[asvetlov]

Fixed by #1086

[lock]

This thread has been automatically locked since there has not been
any recent activity after it was closed. Please open a new issue for
related bugs.

If you feel like there's important points made in this discussion,
please include those exceprts into that new issue.