Generate a :class:`TransactionEnvelope
        <stellar_base.transaction_envelope.TransactionEnvelope>` around the
        generated Transaction via the list of operations in this instance.

        :return: A transaction envelope ready to send over the network.
        :rtype: :class:`TransactionEnvelope
            <stellar_base.transaction_envelope.TransactionEnvelope>`

def gen_te(self):
        """Generate a :class:`TransactionEnvelope
        <stellar_base.transaction_envelope.TransactionEnvelope>` around the
        generated Transaction via the list of operations in this instance.

        :return: A transaction envelope ready to send over the network.
        :rtype: :class:`TransactionEnvelope
            <stellar_base.transaction_envelope.TransactionEnvelope>`

        """
        if self.tx is None:
            self.gen_tx()
        te = Te(self.tx, network_id=self.network)
        if self.te:
            te.signatures = self.te.signatures
        self.te = te
        return te