human
Solve the following python programming problem given the following code:
def assertCancelDuringBodyProduction(self, producerLength) : 
    '
        The L{Deferred} returned by L{HTTP11ClientProtocol.request} will fire
        with a L{RequestGenerationFailed} failure containing a
        L{CancelledError} exception if the request was cancelled before a
        C{bodyProducer} has finished producing.
        ' 
    transport = StringTransport () 
    protocol = HTTP11ClientProtocol () 
    protocol.makeConnection (transport) 
    producer = StringProducer (producerLength) 
    nonLocal = { 
        'cancelled' : False, 
} 
    def cancel(ign) : 
        nonLocal ['cancelled'] = True 
def startProducing(consumer) : 
        producer.consumer = consumer 
        producer.finished = Deferred (cancel) 
        return producer.finished 
producer.startProducing = self 
    result = protocol.request (Request (b'POST', b'/bar', _boringHeaders, producer)) 
    producer.consumer.write ((b'x' * 5)) 
    result.cancel () 
    self.assertTrue (transport.aborting) 
    self.assertTrue (nonLocal ['cancelled']) 
    return assertRequestGenerationFailed (self, result, [CancelledError]) 

    
    

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

producer.startProducing = startProducing