def _validate_day(self, day):
        if day is "*":
            return range(1, 32)
        elif "/" in day:
            return(self._validate_step(day, "day"))
        elif "," in day:
            return(self._validate_list(day, "day"))
        elif "-" in day:
            return(self._validate_range(day, "day"))
        else:
            valid_numbers = range(1, 31)
            if not valid_numbers in int(day):
                raise ValueError, "Invalid day " + str(day)
            else:
                return [int(day)]
dataset/ETHPy150Open kuri65536/python-for-android/python-build/python-libs/gdata/samples/oauth/oauth_on_appengine/appengine_utilities/cron.py/Cron._validate_day/swapped operands of `in`