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  <div class="section" id="module-celery.task.builtins">
<h1>Built-in Task Classes - celery.task.builtins<a class="headerlink" href="#module-celery.task.builtins" title="Permalink to this headline">¶</a></h1>
<dl class="class">
<dt id="celery.task.builtins.DeleteExpiredTaskMetaTask">
<em class="property">
class </em><tt class="descclassname">celery.task.builtins.</tt><tt class="descname">DeleteExpiredTaskMetaTask</tt><a class="headerlink" href="#celery.task.builtins.DeleteExpiredTaskMetaTask" title="Permalink to this definition">¶</a></dt>
<dd><p>A periodic task that deletes expired task metadata every day.</p>
<p>This runs the current backend&#8217;s
<a title="celery.backends.base.BaseBackend.cleanup" class="reference external" href="celery.backends.base.html#celery.backends.base.BaseBackend.cleanup"><tt class="xref docutils literal"><span class="pre">celery.backends.base.BaseBackend.cleanup()</span></tt></a> method.</p>
<dl class="method">
<dt id="celery.task.builtins.DeleteExpiredTaskMetaTask.run">
<tt class="descname">run</tt><big>(</big><em>**kwargs</em><big>)</big><a class="headerlink" href="#celery.task.builtins.DeleteExpiredTaskMetaTask.run" title="Permalink to this definition">¶</a></dt>
<dd>The method run by <tt class="docutils literal"><span class="pre">celeryd</span></tt>.</dd></dl>

</dd></dl>

<dl class="class">
<dt id="celery.task.builtins.PingTask">
<em class="property">
class </em><tt class="descclassname">celery.task.builtins.</tt><tt class="descname">PingTask</tt><a class="headerlink" href="#celery.task.builtins.PingTask" title="Permalink to this definition">¶</a></dt>
<dd><p>The task used by <tt class="xref docutils literal"><span class="pre">ping()</span></tt>.</p>
<dl class="method">
<dt id="celery.task.builtins.PingTask.run">
<tt class="descname">run</tt><big>(</big><em>**kwargs</em><big>)</big><a class="headerlink" href="#celery.task.builtins.PingTask.run" title="Permalink to this definition">¶</a></dt>
<dd><table class="docutils field-list" frame="void" rules="none">
<col class="field-name" />
<col class="field-body" />
<tbody valign="top">
<tr class="field"><th class="field-name">Returns:</th><td class="field-body">the string <tt class="docutils literal"><span class="pre">&quot;pong&quot;</span></tt>.</td>
</tr>
</tbody>
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