human
Solve the following python programming problem given the following code:
def add_observer(self, observer) : 
    '
        Spawns thread or adds IOPSNotificationCreateRunLoopSource directly to provided cf_run_loop
        @see: __init__
        ' 
    super (PowerManagement, self).add_observer (self) 
    if (len (self._weak_observers) == 1) : 
        if (not self._cf_run_loop) : 
            PowerManagement.notifications_observer.addObserver (self) 
else : 
            @ objc.callbackFor (IOPSNotificationCreateRunLoopSource) 
            def on_power_sources_change(context) : 
                self.on_power_source_notification () 
self._source = IOPSNotificationCreateRunLoopSource (on_power_sources_change, None) 
            CFRunLoopAddSource (self._cf_run_loop, self._source, kCFRunLoopDefaultMode) 

    
    

    Fix the buggy line: super (PowerManagement, self).add_observer (self)
assistant
#Here is Python program to fix the buggy line: super (PowerManagement, self).

super (PowerManagement, self).add_observer (observer)