human
Solve the following python programming problem given the following code:
def __init__(self, key, underlying_observable, merged_disposable = None) : 
    super (GroupedObservable, self).__init__ (self._subscribe) 
    self.key = key 
    def subscribe(observer) : 
        return CompositeDisposable (merged_disposable.disposable, underlying_observable.subscribe (observer)) 
self.underlying_observable = (underlying_observable if (not merged_disposable) else AnonymousObservable (underlying_observable)) 

    
    

    Fix the buggy line: self.underlying_observable = (underlying_observable if (not merged_disposable) else AnonymousObservable (underlying_observable))
assistant
#Here is Python program to fix the buggy line: self.

self.underlying_observable = (underlying_observable if (not merged_disposable) else AnonymousObservable (subscribe))