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<h1>2. Writing views in Python<a class="headerlink" href="#writing-views-in-python" title="Permalink to this headline">ΒΆ</a></h1>
<p>The couchdb-python package comes with a view server to allow you to write
views in Python instead of JavaScript. When couchdb-python is installed, it
will install a script called couchpy that runs the view server. To enable
this for your CouchDB server, add the following section to local.ini:</p>
<div class="highlight-python"><div class="highlight"><pre>[query_servers]
python=/usr/bin/couchpy
</pre></div>
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<p>After restarting CouchDB, the Futon view editor should show <code class="docutils literal"><span class="pre">python</span></code> in
the language pull-down menu. Here’s some sample view code to get you started:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="k">def</span> <span class="nf">fun</span><span class="p">(</span><span class="n">doc</span><span class="p">):</span>
<span class="k">if</span> <span class="n">doc</span><span class="p">[</span><span class="s">'date'</span><span class="p">]:</span>
<span class="k">yield</span> <span class="n">doc</span><span class="p">[</span><span class="s">'date'</span><span class="p">],</span> <span class="n">doc</span>
</pre></div>
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<p>Note that the <code class="docutils literal"><span class="pre">map</span></code> function uses the Python <code class="docutils literal"><span class="pre">yield</span></code> keyword to emit
values, where JavaScript views use an <code class="docutils literal"><span class="pre">emit()</span></code> function.</p>
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