human
Solve the following python programming problem given the following code:
def _router_func(action) : 
    def _route_db(self, model, **hints) : 
        chosen_db = None 
        for router in self.routers : 
            try : 
                method = getattr (router, action) 
except AttributeError : 
                pass 
else : 
                chosen_db = method (model, ** hints) 
                if chosen_db : 
                    return chosen_db 
instance = hints.get ('instance') 
        if ((instance is not None) and instance._state.db) : 
            return instance._state.db 
return DEFAULT_DB_ALIAS 
return action 

    
    

    Fix the buggy line: return action
assistant
#Here is Python program to fix the buggy line: return action
.

return def _route_db(