human
Solve the following python programming problem given the following code:
def __call__(self) : 
    def decorator(cls) : 
        if (cls.__name__ not in self.__USES__) : 
            self.__USES__ [cls.__name__] = cls 
return cls 
return self 

    
    

    Fix the buggy line: return self
assistant
#Here is Python code to fix the buggy line: return self
.

return def decorator(