tips: https://github.com/python/cpython/pull/232/files?w=1 can be used to ignore indent changes while review.

@deronnax nice catch!

Oh, I'm very happy to see the removal of the ugly _TracebackLogger class with its giant docstring to justify its design :-) It's also nice to see all conditional code on __del__().

Before approving, how do Python 3.3 users get asyncio? "python3.3 -m install asyncio" which gets https://pypi.python.org/pypi/asyncio backport? This version is no more maintained, right? (Latest release: 2015-03-10.)

The asyncio documentation (on readthedocs.io) requires 3.5 or higher!
http://asyncio.readthedocs.io/en/latest/getting_started.html#python-3-5-or-higher-only

If PyPI package for Python 3.3 is needed, we can export code from 3.6 branch.
It means new features of Python 3.7+ are not ported to asyncio for Python 3.3.

And if asyncio on PyPI won't be updated anymore, we can remove compat module completely.

If PyPI package for Python 3.3 is needed, we can export code from 3.6 branch. It means new features of Python 3.7+ are not ported to asyncio for Python 3.3.

Two years ago, the policy was to use exactly the same code base on all CPython branches and on the https://github.com/python/asyncio project.

What is the current policy?

https://github.com/python/asyncio description is "This project is the asyncio module for Python 3.3". Do we still need this project? This project has 76 open issues and 12 pull requests.

I added @gvanrossum and @1st1 to nosy list of https://bugs.python.org/issue29617 and
waiting future plan of it.

@methane Let's merge this!