def collect_disk_io(self, whitelist=[]):
        stats = psutil.disk_io_counters(perdisk=True)
        for entry, stat in stats.iteritems():
            if not whitelist or entry in whitelist:
                for k, v in stat._asdict().iteritems():
                    self.registry.gauge((entry, k) % "disk-%s.%s").set_value(v)
dataset/ETHPy150Open omergertel/pyformance/example_sysmetrics.py/Collector.collect_disk_io/swapped operands of `%`