code: def reserve(self, amount, account=None, **kwargs):
          
          assert isinstance(amount, Amount)
          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)
          op = operations.Asset_reserve(
              **{
                  "fee": {"amount": 0, "asset_id": "1.3.0"},
                  "payer": account["id"],
                  "amount_to_reserve": {
                      "amount": int(amount),
                      "asset_id": amount["asset"]["id"],
                  },
                  "extensions": [],
              }
          )
          return self.finalizeOp(op, account, "active", **kwargs)
docs: Reserve/Burn an amount of this shares
  
              This removes the shares from the supply
  
              :param bitshares.amount.Amount amount: The amount to be burned.
              :param str account: (optional) the account to allow access
                  to (defaults to ``default_account``)