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  <section id="exceptions">
<span id="asyncio-exceptions"></span><h1>Exceptions<a class="headerlink" href="#exceptions" title="Link to this heading">¶</a></h1>
<p><strong>Source code:</strong> <a class="extlink-source reference external" href="https://github.com/python/cpython/tree/main/Lib/asyncio/exceptions.py">Lib/asyncio/exceptions.py</a></p>
<hr class="docutils" />
<dl class="py exception">
<dt class="sig sig-object py" id="asyncio.TimeoutError">
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">asyncio.</span></span><span class="sig-name descname"><span class="pre">TimeoutError</span></span><a class="headerlink" href="#asyncio.TimeoutError" title="Link to this definition">¶</a></dt>
<dd><p>A deprecated alias of <code class="xref py py-exc docutils literal notranslate"><span class="pre">TimeoutError</span></code>,
raised when the operation has exceeded the given deadline.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.11: </span>This class was made an alias of <code class="xref py py-exc docutils literal notranslate"><span class="pre">TimeoutError</span></code>.</p>
</div>
</dd></dl>

<dl class="py exception">
<dt class="sig sig-object py" id="asyncio.CancelledError">
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">asyncio.</span></span><span class="sig-name descname"><span class="pre">CancelledError</span></span><a class="headerlink" href="#asyncio.CancelledError" title="Link to this definition">¶</a></dt>
<dd><p>The operation has been cancelled.</p>
<p>This exception can be caught to perform custom operations
when asyncio Tasks are cancelled.  In almost all situations the
exception must be re-raised.</p>
<div class="versionchanged">
<p><span class="versionmodified changed">Changed in version 3.8: </span><code class="xref py py-exc docutils literal notranslate"><span class="pre">CancelledError</span></code> is now a subclass of <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> rather than <a class="reference internal" href="exceptions.html#Exception" title="Exception"><code class="xref py py-class docutils literal notranslate"><span class="pre">Exception</span></code></a>.</p>
</div>
</dd></dl>

<dl class="py exception">
<dt class="sig sig-object py" id="asyncio.InvalidStateError">
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">asyncio.</span></span><span class="sig-name descname"><span class="pre">InvalidStateError</span></span><a class="headerlink" href="#asyncio.InvalidStateError" title="Link to this definition">¶</a></dt>
<dd><p>Invalid internal state of <a class="reference internal" href="asyncio-task.html#asyncio.Task" title="asyncio.Task"><code class="xref py py-class docutils literal notranslate"><span class="pre">Task</span></code></a> or <a class="reference internal" href="asyncio-future.html#asyncio.Future" title="asyncio.Future"><code class="xref py py-class docutils literal notranslate"><span class="pre">Future</span></code></a>.</p>
<p>Can be raised in situations like setting a result value for a
<em>Future</em> object that already has a result value set.</p>
</dd></dl>

<dl class="py exception">
<dt class="sig sig-object py" id="asyncio.SendfileNotAvailableError">
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">asyncio.</span></span><span class="sig-name descname"><span class="pre">SendfileNotAvailableError</span></span><a class="headerlink" href="#asyncio.SendfileNotAvailableError" title="Link to this definition">¶</a></dt>
<dd><p>The “sendfile” syscall is not available for the given
socket or file type.</p>
<p>A subclass of <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>
</dd></dl>

<dl class="py exception">
<dt class="sig sig-object py" id="asyncio.IncompleteReadError">
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">asyncio.</span></span><span class="sig-name descname"><span class="pre">IncompleteReadError</span></span><a class="headerlink" href="#asyncio.IncompleteReadError" title="Link to this definition">¶</a></dt>
<dd><p>The requested read operation did not complete fully.</p>
<p>Raised by the <a class="reference internal" href="asyncio-stream.html#asyncio-streams"><span class="std std-ref">asyncio stream APIs</span></a>.</p>
<p>This exception is a subclass of <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>.</p>
<dl class="py attribute">
<dt class="sig sig-object py" id="asyncio.IncompleteReadError.expected">
<span class="sig-name descname"><span class="pre">expected</span></span><a class="headerlink" href="#asyncio.IncompleteReadError.expected" title="Link to this definition">¶</a></dt>
<dd><p>The total number (<a class="reference internal" href="functions.html#int" title="int"><code class="xref py py-class docutils literal notranslate"><span class="pre">int</span></code></a>) of expected bytes.</p>
</dd></dl>

<dl class="py attribute">
<dt class="sig sig-object py" id="asyncio.IncompleteReadError.partial">
<span class="sig-name descname"><span class="pre">partial</span></span><a class="headerlink" href="#asyncio.IncompleteReadError.partial" title="Link to this definition">¶</a></dt>
<dd><p>A string of <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> read before the end of stream was reached.</p>
</dd></dl>

</dd></dl>

<dl class="py exception">
<dt class="sig sig-object py" id="asyncio.LimitOverrunError">
<em class="property"><span class="k"><span class="pre">exception</span></span><span class="w"> </span></em><span class="sig-prename descclassname"><span class="pre">asyncio.</span></span><span class="sig-name descname"><span class="pre">LimitOverrunError</span></span><a class="headerlink" href="#asyncio.LimitOverrunError" title="Link to this definition">¶</a></dt>
<dd><p>Reached the buffer size limit while looking for a separator.</p>
<p>Raised by the <a class="reference internal" href="asyncio-stream.html#asyncio-streams"><span class="std std-ref">asyncio stream APIs</span></a>.</p>
<dl class="py attribute">
<dt class="sig sig-object py" id="asyncio.LimitOverrunError.consumed">
<span class="sig-name descname"><span class="pre">consumed</span></span><a class="headerlink" href="#asyncio.LimitOverrunError.consumed" title="Link to this definition">¶</a></dt>
<dd><p>The total number of to be consumed bytes.</p>
</dd></dl>

</dd></dl>

</section>


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