human
Solve the following python programming problem given the following code:
@ extensionclassmethod (Observable) 
def with_latest_from(cls, * args) : 
    'Merges the specified observable sequences into one observable sequence
    by using the selector function only when the first observable sequence
    produces an element. The observables can be passed either as seperate
    arguments or as a list.

    1 - obs = Observable.with_latest_from(obs1, obs2, obs3,
                                       lambda o1, o2, o3: o1 + o2 + o3)
    2 - obs = Observable.with_latest_from([obs1, obs2, obs3],
                                        lambda o1, o2, o3: o1 + o2 + o3)

    Returns an observable sequence containing the result of combining
    elements of the sources using the specified result selector function.
    ' 
    if (args and isinstance (args [0], list)) : 
        args = args [0] 
else : 
        args = list (args) 
result_selector = args.pop () 
    NO_VALUE = object () 
    def subscribe(observer) : 
        def subscribe_all(parent, * children) : 
            values = [NO_VALUE for _ in children] 
            def subscribe_child(i, child) : 
                subscription = SingleAssignmentDisposable () 
                def on_next(value) : 
                    with parent.lock : 
                        values [i] = value 
subscription.disposable = child.subscribe (on_next, observer.on_error) 
                return subscription 
parent_subscription = SingleAssignmentDisposable () 
            def on_next(value) : 
                with parent.lock : 
                    if (NO_VALUE not in values) : 
                        try : 
                            result = result_selector (value, * values) 
except Exception as error : 
                            observer.on_error (error) 
else : 
                            observer.on_next (result) 
parent_subscription.disposable = parent.subscribe (on_next, observer.on_error, observer.on_completed) 
            return listify_args (parent_subscription, * (subscribe_child (* a) for a in enumerate (children))) 
return...

    
    

    Fix the buggy line: return AnonymousObservable (result_selector)
assistant
#Here is Python program to fix the buggy line: return AnonymousObservable (result_selector)
.

return AnonymousObservable (subscribe)