human
Solve the following python programming problem given the following code:
def __call__(self, func) : 
    @ wraps (func) 
    def _wrapper(* args, **kwargs) : 
        prepared = self.prepare () 
        result = func (* args, ** kwargs) 
        if prepared : 
            self.restore () 
return result 
return self 

    
    

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

return def _wrapper(