code: def list_plugins(self):
          
          rv = []
          for _, modname, ispkg in pkgutil.iter_modules(self.mod.__path__):
              rv.append(modname)
          return sorted(rv)
docs: Returns a sorted list of all plugins that are available in this
          plugin source.  This can be useful to automatically discover plugins
          that are available and is usually used together with
          :meth:`load_plugin`.