[ParkAPI] a modul, to get an old totals value from json file or null

gistfile1.txt

#if a city does not send totals so we push totals to the higest known value in the json file
#
# problem: if one lot name exist twice, it takes always the last value
# but a lot name should never exists more than one time 
def get_lastlots ( lot_name ) :
    import os.path
    lots = 0
    last_values_json = "cache/<city>.json" 
    if os.path.isfile(last_values_json):
        with open(last_values_json) as data_file:
            import json
            last_values = json.load(data_file)

            if last_values is None :
                # if no last json file exists, return 0
                return 0
            for lastlots in last_values["lots"] :
                if lastlots["name"] is lot_name:
                    lots = int(lastlots["total"])
    return lots