human
Solve the following python programming problem given the following code:
def __call__(self, event) : 
    '
        Forward events to contained observers.
        ' 
    if ('log_trace' in event) : 
        def trace(observer) : 
            '
                Add tracing information for an observer.

                @param observer: an observer being forwarded to
                @type observer: L{ILogObserver}
                ' 
            event ['log_trace'].append ((self, observer)) 
else : 
        trace = None 
brokenObservers = [] 
    for observer in brokenObserver._observers : 
        if (trace is not None) : 
            trace (observer) 
try : 
            observer (event) 
except Exception : 
            brokenObservers.append ((observer, Failure ())) 
for (brokenObserver, failure) in brokenObservers : 
        errorLogger = self._errorLoggerForObserver (brokenObserver) 
        errorLogger.failure (OBSERVER_DISABLED, failure = failure, observer = brokenObserver) 

    
    

    Fix the buggy line: for observer in brokenObserver._observers :
assistant
#Here is Python program to fix the buggy line: for observer in brokenObserver.

for observer in self._observers :