resdb_driver/transaction.py [212:254]:
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class TransactionLink(object):
    """! An object for unidirectional linking to a Transaction's Output.
    Attributes:
        txid (str, optional): A Transaction to link to.
        output (int, optional): An output's index in a Transaction with id
        `txid`.
    """

    def __init__(self, txid=None, output=None):
        """! Create an instance of a :class:`~.TransactionLink`.
        Note:
            In an IPLD implementation, this class is not necessary anymore,
            as an IPLD link can simply point to an object, as well as an
            objects properties. So instead of having a (de)serializable
            class, we can have a simple IPLD link of the form:
            `/<tx_id>/transaction/outputs/<output>/`.

            @param txid (str): A Transaction to link to.
            @param output An (int): Outputs's index in a Transaction
            with id `txid`.
        """
        self.txid = txid
        self.output = output

    def __bool__(self):
        return self.txid is not None and self.output is not None

    def __eq__(self, other):
        # TODO: If `other !== TransactionLink` return `False`
        return self.to_dict() == other.to_dict()

    def __hash__(self):
        return hash((self.txid, self.output))

    @classmethod
    def from_dict(cls, link):
        """! Transforms a Python dictionary to a TransactionLink object.

            @param link (dict): The link to be transformed.

            @return :class:`~resdb.transaction.TransactionLink`
        """
        try:
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service/sdk_validator/resdb_validator/transaction.py [228:275]:
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class TransactionLink(object):
    """An object for unidirectional linking to a Transaction's Output.

        Attributes:
            txid (str, optional): A Transaction to link to.
            output (int, optional): An output's index in a Transaction with id
            `txid`.
    """

    def __init__(self, txid=None, output=None):
        """Create an instance of a :class:`~.TransactionLink`.

            Note:
                In an IPLD implementation, this class is not necessary anymore,
                as an IPLD link can simply point to an object, as well as an
                objects properties. So instead of having a (de)serializable
                class, we can have a simple IPLD link of the form:
                `/<tx_id>/transaction/outputs/<output>/`.

            Args:
                txid (str, optional): A Transaction to link to.
                output (int, optional): An Outputs's index in a Transaction with
                    id `txid`.
        """
        self.txid = txid
        self.output = output

    def __bool__(self):
        return self.txid is not None and self.output is not None

    def __eq__(self, other):
        # TODO: If `other !== TransactionLink` return `False`
        return self.to_dict() == other.to_dict()

    def __hash__(self):
        return hash((self.txid, self.output))

    @classmethod
    def from_dict(cls, link):
        """Transforms a Python dictionary to a TransactionLink object.

            Args:
                link (dict): The link to be transformed.

            Returns:
                :class:`~resdb_validator.transaction.TransactionLink`
        """
        try:
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