code: def set_default_account_by_address(self, b58_address: str):
          
          flag = True
          index = -1
          for acct in self.accounts:
              index += 1
              if acct.b58_address == b58_address:
                  flag = False
                  break
          if flag:
              raise SDKException(ErrorCode.get_account_by_address_err)
          for i in range(len(self.accounts)):
              self.accounts[i].is_default = False
          self.accounts[index].is_default = True
          self.default_account_address = b58_address
docs: This interface is used to set default account by given base58 encode address.
  
          :param b58_address: a base58 encode address.