title: How to sum the elements of N lists?
body: <p>can anybody please give me a hint how to aggregate (sum up) specific elements of multiple lists?</p>
  <p>For example I have 20 lists with a similar name pattern, each representing consumption spending over time (i.e. index) of the corresponding household (agent):</p>
  <pre><code>c_agent_0 = [10.0, 11.0, ...]
  .
  .
  .
  c_agent_19 = [8.0, 9.0, ...]
  </code></pre>
  <p>I need something like value = sum of index whatever's in <code>c_agent_*[whatever]</code></p>