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    asyncio

reference implementation of PEP 3156


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Readme

This version is only relevant for Python 3.3, which does not include asyncio in its stdlib.

Master repo: https://github.com/python/asyncio

The asyncio module provides infrastructure for writing single-threaded concurrent code using coroutines, multiplexing I/O access over sockets and other resources, running network clients and servers, and other related primitives. Here is a more detailed list of the package contents:

  • a pluggable event loop with various system-specific implementations;

  • transport and protocol abstractions (similar to those in Twisted);

  • concrete support for TCP, UDP, SSL, subprocess pipes, delayed calls, and others (some may be system-dependent);

  • a Future class that mimics the one in the concurrent.futures module, but adapted for use with the event loop;

  • coroutines and tasks based on yield from (PEP 380), to help write concurrent code in a sequential fashion;

  • cancellation support for Futures and coroutines;

  • synchronization primitives for use between coroutines in a single thread, mimicking those in the threading module;

  • an interface for passing work off to a threadpool, for times when you absolutely, positively have to use a library that makes blocking I/O calls.

Note: The implementation of asyncio was previously called "Tulip".

Installation

To install asyncio, type::

pip install asyncio

asyncio requires Python 3.3 or later! The asyncio module is part of the Python standard library since Python 3.4.

asyncio is a free software distributed under the Apache license version 2.0.

Websites

  • asyncio project at GitHub <https://github.com/python/asyncio>_: source code, bug tracker
  • asyncio documentation <https://docs.python.org/dev/library/asyncio.html>_
  • Mailing list: python-tulip Google Group <https://groups.google.com/forum/?fromgroups#!forum/python-tulip>_
  • IRC: join the #asyncio channel on the Freenode network

Development

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

To run tests, run::

tox

Or use the Makefile::

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:\Python33\python.exe).

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

C> P setup.py build_ext --inplace

If this complains about vcvars.bat, you probably don't have the required version of Visual Studio installed. Compiling extensions for Python 3.3 requires Microsoft Visual C++ 2010 (MSVC 10.0) of any edition; you can download Visual Studio Express 2010 for free from http://www.visualstudio.com/downloads (scroll down to Visual C++ 2010 Express).

Once you have built the _overlapped.pyd extension successfully you can run the tests as follows:

C> P runtests.py

And coverage as follows:

C> P runtests.py --coverage

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