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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>
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<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>
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<span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">main</span><span class="p">():</span>
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<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>
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<p>asyncio is a library to write <strong>concurrent</strong> code using
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the <strong>async/await</strong> syntax.</p>
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<p>asyncio is used as a foundation for multiple Python asynchronous
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frameworks that provide high-performance network and web-servers,
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database connection libraries, distributed task queues, etc.</p>
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<p>asyncio is often a perfect fit for IO-bound and high-level
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<p>asyncio provides a set of <strong>high-level</strong> APIs to:</p>
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<span class="gp">>>> </span><span class="kn">import</span><span class="w"> </span><span class="nn">asyncio</span>
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<span class="gp">>>> </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">10</span><span class="p">,</span> <span class="n">result</span><span class="o">=</span><span class="s1">'hello'</span><span class="p">)</span>
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<p><span class="versionmodified changed">Changed in version 3.13: </span>Uses PyREPL if possible, in which case <span class="target" id="index-0"></span><a class="reference internal" href="../using/cmdline.html#envvar-PYTHONSTARTUP"><code class="xref std std-envvar docutils literal notranslate"><span class="pre">PYTHONSTARTUP</span></code></a> is
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