code: def approveworker(self, workers, account=None, **kwargs):
          
          if not account:
              if "default_account" in self.config:
                  account = self.config["default_account"]
          if not account:
              raise ValueError("You need to provide an account")
          account = Account(account, blockchain_instance=self)
          options = account["options"]
  
          if not isinstance(workers, (list, set, tuple)):
              workers = {workers}
  
          for worker in workers:
              worker = Worker(worker, blockchain_instance=self)
              options["votes"].append(worker["vote_for"])
          options["votes"] = list(set(options["votes"]))
          options["voting_account"] = "1.2.5"  # Account("proxy-to-self")["id"]
  
          op = operations.Account_update(
              **{
                  "fee": {"amount": 0, "asset_id": "1.3.0"},
                  "account": account["id"],
                  "new_options": options,
                  "extensions": {},
                  "prefix": self.prefix,
              }
          )
          return self.finalizeOp(op, account["name"], "active", **kwargs)
docs: Approve a worker
  
              :param list workers: list of worker member name or id
              :param str account: (optional) the account to allow access
                  to (defaults to ``default_account``)