def get_cheapest_flight(source, destination, start_date, end_date):
key = "%s:%s:%s:%s" % (source, destination, start_date, end_date)
cached_cheapest_flight = Redis.get_from_db(key)
if cached_cheapest_flight is None:
cheapest_flight = mainExpedia()
value = json.dumps(cheapest_flight.to_dict())
Redis.add_to_db(key, value)
print "from expedia"
return cheapest_flight
else:
print "from redis"
return Flight.from_dict(json.loads(cached_cheapest_flight))
