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Victor Stinner edited this page Jul 6, 2015 · 3 revisions

The Tulip project is the asyncio module for Python 3.3. Since Python 3.4, asyncio is now part of the standard library.



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.

Hello World using an asyncio coroutine:

import asyncio

def hello_world():
    print("Hello World!")

loop = asyncio.get_event_loop()

For AsyncIO on Python 2, see the trollius project.

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