<span class="n">params</span> <span class="o">=</span> <span class="n">batman</span><span class="o">.</span><span class="n">TransitParams</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">params</span><span class="o">.</span><span class="n">t0</span> <span class="o">=</span> <span class="mf">0.</span>                              <span class="c1">#time of inferior conjunction</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">params</span><span class="o">.</span><