human
Solve the following python programming problem given the following code:
@ extensionclassmethod (Observable) 
def generate(cls, initial_state, condition, iterate, result_selector, scheduler = None) : 
    "Generates an observable sequence by running a state-driven loop
    producing the sequence's elements, using the specified scheduler to
    send out observer messages.

    1 - res = rx.Observable.generate(0,
        lambda x: x < 10,
        lambda x: x + 1,
        lambda x: x)
    2 - res = rx.Observable.generate(0,
        lambda x: x < 10,
        lambda x: x + 1,
        lambda x: x,
        Rx.Scheduler.timeout)

    Keyword arguments:
    initial_state -- Initial state.
    condition -- Condition to terminate generation (upon returning False).
    iterate -- Iteration step function.
    result_selector -- Selector function for results produced in the
        sequence.
    scheduler -- [Optional] Scheduler on which to run the generator loop.
        If not provided, defaults to CurrentThreadScheduler.

    Returns the generated sequence.
    " 
    scheduler = (result_selector or current_thread_scheduler) 
    def subscribe(observer) : 
        first = [True] 
        state = [initial_state] 
        def action(action1, state1 = None) : 
            has_result = False 
            result = None 
            try : 
                if first [0] : 
                    first [0] = False 
else : 
                    state [0] = iterate (state [0]) 
has_result = condition (state [0]) 
                if has_result : 
                    result = result_selector (state [0]) 
except Exception as exception : 
                observer.on_error (exception) 
                return 
if has_result : 
                observer.on_next (result) 
                action1 () 
else : 
                observer.on_completed () 
return scheduler.schedule_recursive (action) 
return AnonymousObservable (subscribe) 

    
    

    Fix the buggy line: scheduler = (result_selector or current_thread_scheduler)
assistant
#Here is Python program to fix the buggy line: scheduler = (result_selector or current_thread_scheduler)
.

scheduler = (scheduler or current_thread_scheduler)