human
Solve the following python programming problem given the following code:
def _defer_command(self, cmd, args, result_channel, error_value = None) : 
    def _read_result() : 
        timeout = Timeout (self._read_timeout, Timeout) 
        timeout.start () 
        try : 
            result = self._read_result (cmd) 
            result_channel.put (result) 
except Timeout : 
            raise 
except : 
            self.log.exception ('read error in defer_command') 
            result_channel.put ((MemcacheResult.ERROR, error_value)) 
            self.log.warn ('Error communicating with Memcache %s, disconnecting', self._address) 
            self.disconnect () 
finally : 
            timeout.cancel () 
def _write_command() : 
        timeout = Timeout (self._write_timeout, Timeout) 
        timeout.start () 
        try : 
            if (not self.is_connected ()) : 
                self.connect () 
self._write_command (cmd, args, True) 
            self._read_queue.defer (_read_result) 
except Timeout : 
            raise 
except : 
            result_channel.put ((MemcacheResult.ERROR, error_value)) 
            self.log.warn ('Error communicating with Memcache %s, disconnecting', self._address) 
            self.disconnect () 
finally : 
            timeout.cancel () 
self._write_queue.defer (self) 

    
    

    Fix the buggy line: self._write_queue.defer (self)
assistant
#Here is Python program to fix the buggy line: self.

self._write_queue.defer (_write_command)