code: def get_account_descendants(self, account):
          
  
          result = []
          for child in account.accounts:
              self._get_account_and_descendants_(child, result)
          return result
docs: Retrieves an account's descendants from the general ledger structure
          given the account name.
  
          :param account_name: The account name.
  
          :returns: The decendants of the account.