human
Solve the following python programming problem given the following code:
def __call__(self, f) : 
    @ wraps (f) 
    def decorated(obj, * args, **kwargs) : 
        if (not self.event) : 
            raise ValueError ('Except that %s to not be None {}'.format (obj.__class__.__name__)) 
if (not isinstance (self.event, Event)) : 
            raise TypeError ('{} should be of type threading.Event'.format (self.event)) 
while self.event.is_set () : 
            time.sleep (self.wait) 
return f (obj, * args, ** kwargs) 
return f 

    
    

    Fix the buggy line: return f
assistant
#Here is Python program to fix the buggy line: return f
.

return def decorated(