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| <span id="asyncio-asynchronous-i-o"></span><h1><code class="xref py py-mod docutils literal notranslate"><span class="pre">asyncio</span></code> — Asynchronous I/O<a class="headerlink" href="#module-asyncio" title="Link to this heading">¶</a></h1> | |
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| <p class="sidebar-title">Hello World!</p> | |
| <div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span><span class="w"> </span><span class="nn">asyncio</span> | |
| <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">main</span><span class="p">():</span> | |
| <span class="nb">print</span><span class="p">(</span><span class="s1">'Hello ...'</span><span class="p">)</span> | |
| <span class="k">await</span> <span class="n">asyncio</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mi">1</span><span class="p">)</span> | |
| <span class="nb">print</span><span class="p">(</span><span class="s1">'... World!'</span><span class="p">)</span> | |
| <span class="n">asyncio</span><span class="o">.</span><span class="n">run</span><span class="p">(</span><span class="n">main</span><span class="p">())</span> | |
| </pre></div> | |
| </div> | |
| </aside> | |
| <p>asyncio is a library to write <strong>concurrent</strong> code using | |
| the <strong>async/await</strong> syntax.</p> | |
| <p>asyncio is used as a foundation for multiple Python asynchronous | |
| frameworks that provide high-performance network and web-servers, | |
| database connection libraries, distributed task queues, etc.</p> | |
| <p>asyncio is often a perfect fit for IO-bound and high-level | |
| <strong>structured</strong> network code.</p> | |
| <div class="admonition seealso"> | |
| <p class="admonition-title">See also</p> | |
| <dl class="simple"> | |
| <dt><a class="reference internal" href="../howto/a-conceptual-overview-of-asyncio.html#a-conceptual-overview-of-asyncio"><span class="std std-ref">A conceptual overview of asyncio</span></a></dt><dd><p>Explanation of the fundamentals of asyncio.</p> | |
| </dd> | |
| </dl> | |
| </div> | |
| <p>asyncio provides a set of <strong>high-level</strong> APIs to:</p> | |
| <ul class="simple"> | |
| <li><p><a class="reference internal" href="asyncio-task.html#coroutine"><span class="std std-ref">run Python coroutines</span></a> concurrently and | |
| have full control over their execution;</p></li> | |
| <li><p>perform <a class="reference internal" href="asyncio-stream.html#asyncio-streams"><span class="std std-ref">network IO and IPC</span></a>;</p></li> | |
| <li><p>control <a class="reference internal" href="asyncio-subprocess.html#asyncio-subprocess"><span class="std std-ref">subprocesses</span></a>;</p></li> | |
| <li><p>distribute tasks via <a class="reference internal" href="asyncio-queue.html#asyncio-queues"><span class="std std-ref">queues</span></a>;</p></li> | |
| <li><p><a class="reference internal" href="asyncio-sync.html#asyncio-sync"><span class="std std-ref">synchronize</span></a> concurrent code;</p></li> | |
| </ul> | |
| <p>Additionally, there are <strong>low-level</strong> APIs for | |
| <em>library and framework developers</em> to:</p> | |
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| <li><p>create and manage <a class="reference internal" href="asyncio-eventloop.html#asyncio-event-loop"><span class="std std-ref">event loops</span></a>, which | |
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| <li><p>implement efficient protocols using | |
| <a class="reference internal" href="asyncio-protocol.html#asyncio-transports-protocols"><span class="std std-ref">transports</span></a>;</p></li> | |
| <li><p><a class="reference internal" href="asyncio-future.html#asyncio-futures"><span class="std std-ref">bridge</span></a> callback-based libraries and code | |
| with async/await syntax.</p></li> | |
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| <div class="highlight-pycon notranslate"><div class="highlight"><pre><span></span><span class="go">$ python -m asyncio</span> | |
| <span class="go">asyncio REPL ...</span> | |
| <span class="go">Use "await" directly instead of "asyncio.run()".</span> | |
| <span class="go">Type "help", "copyright", "credits" or "license" for more information.</span> | |
| <span class="gp">>>> </span><span class="kn">import</span><span class="w"> </span><span class="nn">asyncio</span> | |
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| <p class="rubric">Reference</p> | |
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| <li class="toctree-l1"><a class="reference internal" href="asyncio-platforms.html">Platform Support</a></li> | |
| <li class="toctree-l1"><a class="reference internal" href="asyncio-extending.html">Extending</a></li> | |
| </ul> | |
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| <p class="caption" role="heading"><span class="caption-text">Guides and Tutorials</span></p> | |
| <ul> | |
| <li class="toctree-l1"><a class="reference internal" href="asyncio-api-index.html">High-level API Index</a></li> | |
| <li class="toctree-l1"><a class="reference internal" href="asyncio-llapi-index.html">Low-level API Index</a></li> | |
| <li class="toctree-l1"><a class="reference internal" href="asyncio-dev.html">Developing with asyncio</a></li> | |
| </ul> | |
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| <div class="admonition note"> | |
| <p class="admonition-title">Note</p> | |
| <p>The source code for asyncio can be found in <a class="extlink-source reference external" href="https://github.com/python/cpython/tree/main/Lib/asyncio/">Lib/asyncio/</a>.</p> | |
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