def _read_data(self, spider, request):
        key = self._request_key(request)
        try:
            ts = self.db.Get(key + b'_time')
        except KeyError:
            return  # not found or invalid entry

        if self.expiration_secs < time() - float(ts) < 0:
            return  # expired

        try:
            data = self.db.Get(key + b'_data')
        except KeyError:
            return  # invalid entry
        else:
            return pickle.loads(data)
dataset/ETHPy150Open scrapy/scrapy/scrapy/extensions/httpcache.py/LeveldbCacheStorage._read_data/swapped operands of `<`