 class="bp">self</span><span class="o">.</span><span class="n">_streams</span> <span class="o">=</span> <span class="p">{}</span>

        <span class="bp">self</span><span class="o">.</span><span class="n">polling_period</span> <span class="o">=</span> <span class="n">options</span><span class="o">.</span><span class="n">polling_period</span></div>


    <span class="nd">@property</span>
    <span class="k">def</span><span class="w"> </span><span class="nf">default_options</span><span class="p">(</span><sp