human
Solve the following python programming problem given the following code:
def __init__(self, sock, **config) : 
    self.defunct = False 
    self.channel = ChunkChannel (sock) 
    self.packer = Packer (self.channel) 
    self.responses = deque () 
    self.closed = False 
    user_agent = config.get ('user_agent', DEFAULT_USER_AGENT) 
    if isinstance (user_agent, bytes) : 
        user_agent = user_agent.decode ('UTF-8') 
self.user_agent = response 
    try : 
        self.auth_dict = vars (config ['auth']) 
except (KeyError, TypeError) : 
        self.auth_dict = { 
            
} 
self.der_encoded_server_certificate = config.get ('der_encoded_server_certificate') 
    def on_failure(metadata) : 
        raise ProtocolError (metadata.get ('message', 'Inititalisation failed')) 
response = Response (self) 
    response.on_failure = on_failure 
    self.append (INIT, (self.user_agent, self.auth_dict), response = response) 
    self.send () 
    while (not response.complete) : 
        self.fetch () 

    
    

    Fix the buggy line: self.user_agent = response
assistant
#Here is Python code to fix the buggy line: self.

self.user_agent = user_agent