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Experimental port of the Tulip project (asyncio module, PEP 3156) on Python 2.7

Project description

Trollius is an experimental port of the Tulip project (asyncio module, PEP 3156) on Python 2.7.


The futures project is needed on Python 2 to get a backport of concurrent.futures.

The concurrent.futures is optional, it is only required when BaseEventLoop.run_in_executor() is used. This method is used by BaseEventLoop.getaddrinfo() and BaseEventLoop.getnameinfo().

Unit tests require the mock module:

Differences between Trollius and Tulip

  • Python 2 has no keyword-only parameters
  • Trollius coroutines use yield whereas Tulip coroutines must use yield-from
  • Trollius coroutines must use “raise Return(value)”, whereas Tulip simply uses “return value” thanks to Python 3.3 improvments
  • If the concurrent.futures module is missing, BaseEventLoop.run_in_executor() raises NotImplementedError and asyncio.wrap_future() is not available


The actual code lives in the ‘asyncio’ subdirectory. Tests are in the ‘tests’ subdirectory.

To run tests:
  • make test
To run coverage (coverage package is required):
  • make coverage

On Windows, things are a little more complicated. Assume ‘P’ is your Python binary (for example C:Python33python.exe).

You must first build the _overlapped.pyd extension and have it placed in the asyncio directory, as follows:

C> P build_ext –inplace

Then you can run the tests as follows:

C> P

And coverage as follows:

C> P –coverage

–Guido van Rossum <>

Trollius name

Extract of :

Trollius is a genus of about 30 species of plants in the family Ranunculaceae, closely related to Ranunculus. The common name of some species is globeflower or globe flower. Native to the cool temperate regions of the Northern Hemisphere, with the greatest diversity of species in Asia, trollius usually grow in heavy, wet clay soils.

Change log

2014-01-04: version 0.1

  • First public release

Project details

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