meterer.set_limits_for_pool(pool, [time_period=value])

        Sets the limits for the given pool. The valid time_periods are:
        year, month, week, day, hour.

def set_limits_for_pool(self, pool, **kw):
        """
        meterer.set_limits_for_pool(pool, [time_period=value])

        Sets the limits for the given pool. The valid time_periods are:
        year, month, week, day, hour.
        """
        pool_limits = {}

        for time_period in ["year", "month", "week", "day", "hour"]:
            if time_period not in kw:
                continue

            limit = kw.pop(time_period)
            if limit is not None and not isinstance(limit, (float, int)):
                raise TypeError("%s must be a float or int or None",
                                time_period)
            pool_limits[time_period] = limit

        if kw:
            raise ValueError("Unknown time periods specified: %s" %
                             ", ".join(kw.keys()))

        self.cache.set("LIMIT:%s" % pool, json_dumps(pool_limits))
        return