def _unique_class(self, cls):
        """
        internal method to check if any of the plugins are instances
        of a given cls
        """
        return not any(isinstance(obj, cls) for obj in self.plugins)
def _unique_class ( self , cls ) : return not any ( isinstance ( obj , cls ) for obj in self . plugins )
internal method to check if any of the plugins are instances
        of a given cls