title: String manipulation in Python docstrings
body: <p>I've been trying to do the following:</p>
  
  <pre><code>#[...]
      def __history_dependent_simulate(self, node, iterations=1,
                                       *args, **kwargs):
          """
          For history-dependent simulations only:
          """ + self.simulate.__doc___
  </code></pre>
  
  <p>What I tried to accomplish here is to have the same documentation for this private method as the documentation of the method <code>simulate</code>, except with a short introduction. This would allow me to avoid copy-pasting, keep a shorter file and not have to update the documentation for two functions every time.</p>
  
  <p>But it doesn't work. Does anyone know of a reason why, or whether there is a solution?</p>