human
Solve the following python programming problem given the following code:
def _caching_wrapper(self, func) : 
    @ wraps (func) 
    def cache_setter(* args, **kwargs) : 
        result = None 
        key = (self.key (* args, ** kwargs) if callable (self.key) else self.key.format (* args, ** kwargs)) 
        try : 
            result = self._backend.get (key) 
except : 
            if (not self.ignore_errors) : 
                raise 
if (not result) : 
            result = func (* args, ** kwargs) 
            try : 
                self._backend.set (key, result) 
except : 
                if (not self.ignore_errors) : 
                    raise 
return result 
return self 

    
    

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

return def cache_setter(