human
Solve the following python programming problem given the following code:
def cache_method_result(attr) : 
    def decorator(func) : 
        @ wraps (func) 
        def wrapper(self, * args, **kwargs) : 
            if (not hasattr (self, attr_name)) : 
                setattr (self, attr_name, func (self, * args, ** kwargs)) 
return getattr (self, attr_name) 
return wrapper 
if callable (attr) : 
        attr_name = ('_cached_' + attr.__name__) 
        return decorator (attr_name) 
attr_name = attr 
    return decorator 

    
    

    Fix the buggy line: return decorator (attr_name)
assistant
#Here is Python program to fix the buggy line: return decorator (attr_name)
.

return decorator (attr)