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:mod:`asyncio` --- Asynchronous I/O, event loop, coroutines and tasks ===================================================================== .. module:: asyncio :synopsis: Asynchronous I/O, event loop, coroutines and tasks. .. versionadded:: 3.4 **Source code:** :source:`Lib/asyncio/` -------------- This 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 :ref:`event loop <asyncio-event-loop>` with various system-specific implementations; * :ref:`transport <asyncio-transport>` and :ref:`protocol <asyncio-protocol>` abstractions (similar to those in `Twisted <https://twistedmatrix.com/trac/>`_); * concrete support for TCP, UDP, SSL, subprocess pipes, delayed calls, and others (some may be system-dependent); * a :class:`Future` class that mimics the one in the :mod:`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 :class:`Future`\s and coroutines; * :ref:`synchronization primitives <asyncio-sync>` for use between coroutines in a single thread, mimicking those in the :mod:`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. Asynchronous programming is more complex than classical "sequential" programming: see the :ref:`Develop with asyncio <asyncio-dev>` page which lists common traps and explains how to avoid them. :ref:`Enable the debug mode <asyncio-debug-mode>` during development to detect common issues. Table of contents: .. toctree:: :maxdepth: 3 asyncio-eventloop.rst asyncio-eventloops.rst asyncio-task.rst asyncio-protocol.rst asyncio-stream.rst asyncio-subprocess.rst asyncio-sync.rst asyncio-queue.rst asyncio-dev.rst .. seealso:: The :mod:`asyncio` module was designed in :PEP:`3156`. For a motivational primer on transports and protocols, see :PEP:`3153`.