human
Solve the following python programming problem given the following code:
@ cached (num_args = 3) 
def _get_current_state_for_key(self, room_id, event_type, state_key) : 
    def f(txn) : 
        sql = 'SELECT event_id FROM current_state_events WHERE room_id = ? AND type = ? AND state_key = ?' 
        args = (room_id, event_type, state_key) 
        txn.execute (sql, args) 
        results = txn.fetchall () 
        return [r [0] for r in results] 
return self.runInteraction ('get_current_state_for_key', state_key) 

    
    

    Fix the buggy line: return self.runInteraction ('get_current_state_for_key', state_key)
assistant
#Here is Python program to fix the buggy line: return self.

return self.runInteraction ('get_current_state_for_key', def f()