">.</span><span class="n">reactions</span><span class="o">.</span><span class="n">get_by_id</span><span class="p">(</span><span class="n">rid</span><span class="p">)</span><span class="o">.</span><span class="n">knock_out</span><span class="p">()</span>

        <span class="c1"># create a task evaluator instance with the context specific model and the supplied</span>
        <span class="c1"># task list and solver</span>
        <span class="n">task_eval</span> <span class="o">=</span> <span class="n">Task