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  <div class="section" id="module-celery.utils">
<h1>Multiprocessing Worker - celery.worker<a class="headerlink" href="#module-celery.utils" title="Permalink to this headline">¶</a></h1>
<p>Utility functions</p>
<dl class="function">
<dt id="celery.utils.chunks">
<tt class="descclassname">celery.utils.</tt><tt class="descname">chunks</tt><big>(</big><em>it</em>, <em>n</em><big>)</big><a class="headerlink" href="#celery.utils.chunks" title="Permalink to this definition">¶</a></dt>
<dd><p>Split an iterator into chunks with <tt class="docutils literal"><span class="pre">n</span></tt> elements each.</p>
<p>Examples</p>
<blockquote>
<p># n == 2
&gt;&gt;&gt; x = chunks(iter([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]), 2)
&gt;&gt;&gt; list(x)
[[0, 1], [2, 3], [4, 5], [6, 7], [8, 9], [10]]</p>
<p># n == 3
&gt;&gt;&gt; x = chunks(iter([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]), 3)
&gt;&gt;&gt; list(x)
[[0, 1, 2], [3, 4, 5], [6, 7, 8], [9, 10]]</p>
</blockquote>
</dd></dl>

<dl class="function">
<dt id="celery.utils.gen_unique_id">
<tt class="descclassname">celery.utils.</tt><tt class="descname">gen_unique_id</tt><big>(</big><big>)</big><a class="headerlink" href="#celery.utils.gen_unique_id" title="Permalink to this definition">¶</a></dt>
<dd><p>Generate a unique id, having - hopefully - a very small chance of
collission.</p>
<p>For now this is provided by <tt class="xref docutils literal"><span class="pre">uuid.uuid4()</span></tt>.</p>
</dd></dl>

<dl class="function">
<dt id="celery.utils.get_full_cls_name">
<tt class="descclassname">celery.utils.</tt><tt class="descname">get_full_cls_name</tt><big>(</big><em>cls</em><big>)</big><a class="headerlink" href="#celery.utils.get_full_cls_name" title="Permalink to this definition">¶</a></dt>
<dd>With a class, get its full module and class name.</dd></dl>

<dl class="function">
<dt id="celery.utils.mitemgetter">
<tt class="descclassname">celery.utils.</tt><tt class="descname">mitemgetter</tt><big>(</big><em>*keys</em><big>)</big><a class="headerlink" href="#celery.utils.mitemgetter" title="Permalink to this definition">¶</a></dt>
<dd>Like <tt class="xref docutils literal"><span class="pre">operator.itemgetter()</span></tt> but returns <cite>None</cite> on missing keys
instead of raising <tt class="xref docutils literal"><span class="pre">KeyError</span></tt>.</dd></dl>

<dl class="function">
<dt id="celery.utils.repeatlast">
<tt class="descclassname">celery.utils.</tt><tt class="descname">repeatlast</tt><big>(</big><em>it</em><big>)</big><a class="headerlink" href="#celery.utils.repeatlast" title="Permalink to this definition">¶</a></dt>
<dd>Iterate over all elements in the iterator, and when its exhausted
yield the last value infinitely.</dd></dl>

<dl class="function">
<dt id="celery.utils.retry_over_time">
<tt class="descclassname">celery.utils.</tt><tt class="descname">retry_over_time</tt><big>(</big><em>fun</em>, <em>catch</em>, <em>args=</em><span class="optional">[</span><span class="optional">]</span>, <em>kwargs={}</em>, <em>errback=&lt;function &lt;lambda&gt; at 0x21b6af0&gt;</em>, <em>max_retries=None</em>, <em>interval_start=2</em>, <em>interval_step=2</em>, <em>interval_max=30</em><big>)</big><a class="headerlink" href="#celery.utils.retry_over_time" title="Permalink to this definition">¶</a></dt>
<dd><p>Retry the function over and over until max retries is exceeded.</p>
<p>For each retry we sleep a for a while before we try again, this interval
is increased for every retry until the max seconds is reached.</p>
<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">Parameters:</th><td class="field-body"><ul class="first last simple">
<li><em>fun</em> &#8211; The function to try</li>
<li><em>catch</em> &#8211; Exceptions to catch, can be either tuple or a single
exception class.</li>
<li><em>args</em> &#8211; Positional arguments passed on to the function.</li>
<li><em>kwargs</em> &#8211; Keyword arguments passed on to the function.</li>
<li><em>errback</em> &#8211; Callback for when an exception in <tt class="docutils literal"><span class="pre">catch</span></tt> is raised.
The callback must take two arguments: <tt class="docutils literal"><span class="pre">exc</span></tt> and <tt class="docutils literal"><span class="pre">interval</span></tt>, where
<tt class="docutils literal"><span class="pre">exc</span></tt> is the exception instance, and <tt class="docutils literal"><span class="pre">interval</span></tt> is the time in
seconds to sleep next..</li>
<li><em>max_retries</em> &#8211; Maximum number of retries before we give up.
If this is not set, we will retry forever.</li>
<li><em>interval_start</em> &#8211; How long (in seconds) we start sleeping between
retries.</li>
<li><em>interval_step</em> &#8211; By how much the interval is increased for each
retry.</li>
<li><em>interval_max</em> &#8211; Maximum number of seconds to sleep between retries.</li>
</ul>
</td>
</tr>
</tbody>
</table>
</dd></dl>

</div>


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