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server = ECMWFService("mars")
req = {
    "class": "od",
    "date": "20150101",
    "expver": "1",
    "levtype": "sfc",
    "param": "167.128",
    "step": "0/to/240/by/12",
    "stream": "oper",
    "time": "00",
    "type": "fc"
    }

kv='list,'+''.join(['{}={},\n'.format(keyk, valv) for keyk, valv in req.items())+']
kv='list,{} output=cost'.format(','.join(kv))

server.execute(kv,'target.txt')