cpython/Doc/library/asyncio.rst

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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
Introduction
------------
This package includes a pluggable event loop, transport and protocol
abstractions similar to those in Twisted, and a higher-level scheduler
for coroutines and tasks based on ``yield from`` (:PEP:`380`).
Full documentation is not yet ready; we hope to have it written
before Python 3.4 leaves beta. Until then, the best reference is
:PEP:`3156`. For a motivational primer on transports and protocols,
see :PEP:`3153`.