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<spanclass="k">return</span><spanclass="p">(</span><spanclass="s2">"<</span><spanclass="si">{}</span><spanclass="s2"> object of </span><spanclass="si">{}</span><spanclass="s2"> artists>"</span>
<spanclass="bp">self</span><spanclass="o">.</span><spanclass="n">eventson</span><spanclass="o">=</span><spanclass="kc">False</span><spanclass="c1"># fire events only if eventson</span>
<spanclass="bp">self</span><spanclass="o">.</span><spanclass="n">_oid</span><spanclass="o">=</span><spanclass="mi">0</span><spanclass="c1"># an observer id</span>
<spanclass="bp">self</span><spanclass="o">.</span><spanclass="n">_propobservers</span><spanclass="o">=</span><spanclass="p">{}</span><spanclass="c1"># a dict from oids to funcs</span>