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18.5. asyncio â Asynchronous I/O, event loop, coroutines and tasks — Python 3.4.10 documentation

18.5. asyncio – Asynchronous I/O, event loop, coroutines and tasksÂ¶

Note

The asyncio package has been included in the standard library on a provisional basis. Backwards incompatible changes (up to and including removal of the module) may occur if deemed necessary by the core developers.

New in version 3.4.

Source code: 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 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.

Asynchronous programming is more complex than classical “sequential” programming: see the Develop with asyncio page which lists common traps and explains how to avoid them. Enable the debug mode during development to detect common issues.

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Showing content from https://docs.python.org/3.4/library/asyncio.html below:

18.5. asyncio â Asynchronous I/O, event loop, coroutines and tasks — Python 3.4.10 documentation

18.5. asyncio â Asynchronous I/O, event loop, coroutines and tasks — Python 3.4.10 documentation