code: def command_path(self):
          
          rv = ''
          if self.info_name is not None:
              rv = self.info_name
          if self.parent is not None:
              rv = self.parent.command_path + ' ' + rv
          return rv.lstrip()
docs: The computed command path.  This is used for the ``usage``
          information on the help page.  It's automatically created by
          combining the info names of the chain of contexts to the root.