How to use the huey.contrib.sqlitedb.KeyValue function in huey

def kv(self, *columns):
        return KeyValue.select(*columns).where(KeyValue.queue == self.name)

def put_data(self, key, value):
        KeyValue.replace(queue=self.name, key=key, value=value).execute()

def pop_data(self, key):
        try:
            kv = self.kv().where(KeyValue.key == key).get()
        except KeyValue.DoesNotExist:
            return EmptyData
        else:
            dq = KeyValue.delete().where(
                (KeyValue.queue == self.name) &
                (KeyValue.key == key))
            return kv.value if dq.execute() == 1 else EmptyData

def pop_data(self, key):
        try:
            kv = self.kv().where(KeyValue.key == key).get()
        except KeyValue.DoesNotExist:
            return EmptyData
        else:
            dq = KeyValue.delete().where(
                (KeyValue.queue == self.name) &
                (KeyValue.key == key))
            return kv.value if dq.execute() == 1 else EmptyData

def peek_data(self, key):
        try:
            kv = self.kv(KeyValue.value).where(KeyValue.key == key).get()
        except KeyValue.DoesNotExist:
            return EmptyData
        else:
            return kv.value

def put_if_empty(self, key, value):
        try:
            (KeyValue
             .insert(queue=self.name, key=key, value=value)
             .on_conflict('abort')
             .execute())
        except IntegrityError:
            return False
        else:
            return True

def pop_data(self, key):
        try:
            kv = self.kv().where(KeyValue.key == key).get()
        except KeyValue.DoesNotExist:
            return EmptyData
        else:
            dq = KeyValue.delete().where(
                (KeyValue.queue == self.name) &
                (KeyValue.key == key))
            return kv.value if dq.execute() == 1 else EmptyData