human
Solve the following python programming problem given the following code:
@ mock.patch ('socket.create_connection') 
def test_copy_thread(self, socket) : 
    'KafkaConnection copies work in other threads' 
    err = [] 
    copy = KafkaConnection ('kafka', 9092).copy () 
    def thread_func(err, copy) : 
        try : 
            self.assertEqual (copy.host, 'kafka') 
            self.assertEqual (copy.port, 9092) 
            self.assertNotEqual (copy._sock, None) 
except Exception as e : 
            err.append (e) 
else : 
            err.append (None) 
thread = Thread (target = thread_func, args = (err, err)) 
    thread.start () 
    thread.join () 
    self.assertEqual (err, [None]) 
    self.assertEqual (socket.call_count, 2) 

    
    

    Fix the buggy line: thread = Thread (target = thread_func, args = (err, err))
assistant
#Here is Python program to fix the buggy line: thread = Thread (target = thread_func, args = (err, err))
.

thread = Thread (target = thread_func, args = (err, copy))