span class="bp">self</span><span class="p">,</span> <span class="n">key</span><span class="p">,</span> <span class="n">item</span><span class="p">):</span>
        <span class="sd">&quot;&quot;&quot;</span>
<span class="sd">        look at only one association</span>

<span class="sd">        will not fail if key does not exist.</span>
<span class="sd">        &quot;&quot;&quot;</span>
        <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">has_key</span><span c