reference implementation of PEP 3156
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”.
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.
The actual code lives in the ‘asyncio’ subdirectory. Tests are in the ‘tests’ subdirectory.
To run tests, run:
Or use the Makefile:
To run coverage (coverage package is required):
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 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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