human
Solve the following python programming problem given the following code:
@ extensionmethod (Observable) 
def some(self, predicate = None) : 
    'Determines whether some element of an observable sequence satisfies a
    condition if present, else if some items are in the sequence.

    Example:
    result = source.some()
    result = source.some(lambda x: x > 3)

    Keyword arguments:
    predicate -- A function to test each element for a condition.

    Returns {Observable} an observable sequence containing a single element
    determining whether some elements in the source sequence pass the test
    in the specified predicate if given, else if some items are in the
    sequence.
    ' 
    source = self 
    def subscribe(observer) : 
        def on_next(_) : 
            observer.on_next (True) 
            observer.on_completed () 
def on_error() : 
            observer.on_next (False) 
            observer.on_completed () 
return source.subscribe (on_next, observer.on_error, on_error) 
return (source.filter (predicate).some () if self else AnonymousObservable (subscribe)) 

    
    

    Fix the buggy line: return (source.filter (predicate).some () if self else AnonymousObservable (subscribe))
assistant
#Here is Python code to fix the buggy line: return (source.

return (source.filter (predicate).some () if predicate else AnonymousObservable (subscribe))