code: def newick(self):
          
          n = self._tree.as_string('newick',
                                   suppress_rooting=True,
                                   suppress_internal_node_labels=True)
          if n:
              return n.strip(';\n') + ';'
          return n
docs: For more control the dendropy method self.as_string('newick', **kwargs)
          can be used.
          KWargs include:
          suppress_internal_node_labels [True/False]
              - turn on/off bootstrap labels
          suppress_rooting [True/False]
              - turn on/off [&U] or [&R] rooting
                state labels
          edge_label_compose_func
              - function to convert edge lengths:
                takes edge as arg, returns string