human
Solve the following python programming problem given the following code:
def once(self) : 
    '
        Returns a function that will be executed at most one time,
        no matter how often you call it. Useful for lazy initialization.
        ' 
    ns = self.Namespace () 
    ns.memo = None 
    ns.run = False 
    def work_once(* args, **kwargs) : 
        if (ns.run is False) : 
            ns.memo = self.obj (* args, ** kwargs) 
ns.run = True 
        return ns.memo 
return self._wrap (self) 

    
    

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

return self._wrap (def work_once()