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<section id="exceptions">
<span id="asyncio-exceptions"></span><h1>异常<a class="headerlink" href="#exceptions" title="永久链接至标题"></a></h1>
<p><strong>源代码:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/3.8/Lib/asyncio/exceptions.py">Lib/asyncio/exceptions.py</a></p>
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<dd><p>该操作已超过规定的截止日期。</p>
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<p class="admonition-title">重要</p>
<p>这个异常与内置 <a class="reference internal" href="exceptions.html#TimeoutError" title="TimeoutError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">TimeoutError</span></code></a> 异常不同。</p>
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<p>取消asyncio任务时可以捕获此异常以执行自定义操作。在几乎所有情况下都必须重新引发异常。</p>
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<p><span class="versionmodified changed">在 3.8 版更改: </span><a class="reference internal" href="#asyncio.CancelledError" title="asyncio.CancelledError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">CancelledError</span></code></a> 现在是 <a class="reference internal" href="exceptions.html#BaseException" title="BaseException"><code class="xref py py-class docutils literal notranslate"><span class="pre">BaseException</span></code></a> 的子类。</p>
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<p>在为已设置结果值的未来对象设置结果值等情况下,可以引发此问题。</p>
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<p>子类 <a class="reference internal" href="exceptions.html#RuntimeError" title="RuntimeError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">RuntimeError</span></code></a></p>
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<p><a class="reference internal" href="asyncio-stream.html#asyncio-streams"><span class="std std-ref">asyncio stream APIs</span></a> 提出</p>
<p>此异常是 <a class="reference internal" href="exceptions.html#EOFError" title="EOFError"><code class="xref py py-exc docutils literal notranslate"><span class="pre">EOFError</span></code></a> 的子类。</p>
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<code class="sig-name descname">expected</code><a class="headerlink" href="#asyncio.IncompleteReadError.expected" title="永久链接至目标"></a></dt>
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<code class="sig-name descname">partial</code><a class="headerlink" href="#asyncio.IncompleteReadError.partial" title="永久链接至目标"></a></dt>
<dd><p>到达流结束之前读取的 <a class="reference internal" href="stdtypes.html#bytes" title="bytes"><code class="xref py py-class docutils literal notranslate"><span class="pre">bytes</span></code></a> 字符串。</p>
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