class Record:
    """Data record in data stream"""

    def __init__(self, value):
        self.value = value
        self.stream = None

    def __repr__(self):
        return "Record({})".format(self.value)

    def __eq__(self, other):
        if type(self) is type(other):
            return (self.stream, self.value) == (other.stream, other.value)
        return False

    def __hash__(self):
        return hash((self.stream, self.value))


class KeyRecord(Record):
    """Data record in a keyed data stream"""

    def __init__(self, key, value):
        super().__init__(value)
        self.key = key

    def __eq__(self, other):
        if type(self) is type(other):
            return (self.stream, self.key, self.value) ==\
                   (other.stream, other.key, other.value)
        return False

    def __hash__(self):
        return hash((self.stream, self.key, self.value))