human
Solve the following python programming problem given the following code:
def add_queue_handler(self, queue, handler) : 
    def process() : 
        while (not self.xmpp.stop.isSet ()) : 
            (_, data) = self.redis.blpop (queue) 
            handler (data) 
self._handlers [queue] = self 

    
    

    Fix the buggy line: self._handlers [queue] = self
assistant
#Here is Python code to fix the buggy line: self.

self._handlers [queue] = def process(