code: def approveproposal(self, proposal_ids, account=None, approver=None, **kwargs):
          
          from .proposal import Proposal
  
          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)
          is_key = approver and approver[:3] == self.prefix
          if not approver and not is_key:
              approver = account
          elif approver and not is_key:
              approver = Account(approver, blockchain_instance=self)
          else:
              approver = PublicKey(approver)
  
          if not isinstance(proposal_ids, (list, set, tuple)):
              proposal_ids = {proposal_ids}
  
          op = []
          for proposal_id in proposal_ids:
              proposal = Proposal(proposal_id, blockchain_instance=self)
              update_dict = {
                  "fee": {"amount": 0, "asset_id": "1.3.0"},
                  "fee_paying_account": account["id"],
                  "proposal": proposal["id"],
                  "prefix": self.prefix,
              }
              if is_key:
                  update_dict.update({"key_approvals_to_add": [str(approver)]})
              else:
                  update_dict.update({"active_approvals_to_add": [approver["id"]]})
              op.append(operations.Proposal_update(**update_dict))
          if is_key:
              self.txbuffer.appendSigner(approver, "active")
              return self.finalizeOp(op, account["name"], "active", **kwargs)
          return self.finalizeOp(op, approver, "active", **kwargs)
docs: Approve Proposal
  
              :param list proposal_id: Ids of the proposals
              :param str appprover: The account or key to use for approval
                  (defaults to ``account``)
              :param str account: (optional) the account to allow access
                  to (defaults to ``default_account``)