Append a :class:`CreateAccount
        <stellar_base.operation.CreateAccount>` operation to the list of
        operations.

        :param str destination: Account address that is created and funded.
        :param str starting_balance: Amount of XLM to send to the newly created
            account. This XLM comes from the source account.
        :param str source: The source address to deduct funds from to fund the
            new account.
        :return: This builder instance.

def append_create_account_op(self,
                                 destination,
                                 starting_balance,
                                 source=None):
        """Append a :class:`CreateAccount
        <stellar_base.operation.CreateAccount>` operation to the list of
        operations.

        :param str destination: Account address that is created and funded.
        :param str starting_balance: Amount of XLM to send to the newly created
            account. This XLM comes from the source account.
        :param str source: The source address to deduct funds from to fund the
            new account.
        :return: This builder instance.

        """
        op = operation.CreateAccount(destination, starting_balance, source)
        return self.append_op(op)