@property
    def uid(self):
        master_instance = getattr(self.master, 'instance', None)
        if master_instance is self:
            return self.id
        else:
            return "%s-%s" + (self.master.id, self.id)
dataset/ETHPy150Open ployground/ploy/ploy/common.py/BaseInstance.uid/operator `%` -> `+`