code: def action_fluents(self) -> Dict[str, PVariable]:
          '''Returns action-fluent pvariables.'''
          return { str(pvar): pvar for pvar in self.pvariables if pvar.is_action_fluent() f action_fluents(self) -> Dict[str, PVariable]:
          '''Returns action-fluent pvariables.'''
          return { str(pvar): pvar for pvar in self.pvariables if pvar.is_action_fluent() }
docs: Returns action-fluent pvariables.