code: def exclude(self, target, operation, role, value):
          
  
          target = {"result": self.data["proxies"]["result"],
                    "instance": self.data["proxies"]["instance"],
                    "plugin": self.data["proxies"]["plugin"]}[target]
  
          if operation == "add":
              target.add_exclusion(role, value)
  
          elif operation == "remove":
              target.remove_exclusion(role, value)
  
          else:
              raise TypeError("operation must be either `add` or `remove`")
docs: Exclude a `role` of `value` at `target`
  
          Arguments:
              target (str): Destination proxy model
              operation (str): "add" or "remove" exclusion
              role (str): Role to exclude
              value (str): Value of `role` to exclude