The exact error message depends on the version of Trollius and Tulip, if they have the new create_task() function. The check may be removed later when Trollius and Tulip with create_task() will be widely deployed.
Support for greenlets in asyncio.
Requires asyncio, greenlet and Python 3.3 / 3.4.
See examples and unittests for details. To run tests: "$ python3 runtests.py"
License: Apache 2.0