def random(self, n=None):
        return self.database.srandmember(self.key, n)
Test iteration over periods (weeks)
dataset/ETHPy150Open coleifer/walrus/walrus/containers.py/Set.random--crossover with--dataset/ETHPy150Open sahana/eden/modules/unit_tests/s3/s3timeplot.py/EventFrameTests.testPeriodsWeeks