human
Solve the following python programming problem given the following code:
def test_update_progress_within_bounds(self) : 
    values = [0.0, 0.5, 1.0] 
    result = [] 
    def progress_callback(event_type, details) : 
        result.append (details.pop ('progress')) 
a_task = ProgressTask () 
    a_task.notifier.register (task.EVENT_UPDATE_PROGRESS, result) 
    a_task.execute (values) 
    self.assertEqual (values, result) 

    
    

    Fix the buggy line: a_task.notifier.register (task.EVENT_UPDATE_PROGRESS, result)
assistant
#Here is Python program to fix the buggy line: a_task.

a_task.notifier.register (task.EVENT_UPDATE_PROGRESS, def progress_callback()