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• The objective of this example is to demonstrate how to make a request efficient by iterating properly over several hindcastYears, hindcastMonths and hindcastDays
• It can be used as a starting point however you need to adapt it to your needseg to set the keyword values (eg hindcastYear).
• In this way you can extend this request to download the whole S2S CMA reforecast,  but don't forget to check CMA availability

 Please note: use the variable "target"  to write each hindcastDate on a separate file .

#!/usr/bin/env python
from ecmwfapi import ECMWFDataServer
server = ECMWFDataServer()

origin = "babj"
modelVersionDate = "2014-05-01"

def retrieve_data(hindcastDate,modelVersionDate,centre):
    target = "target_s2s_%s_%s.grb" % centre % hindcastDate
    server.retrieve({
       "class": "s2",
       "dataset": "s2s",
       "date": modelVersionDate,
       "expver": "prod",
       "hdate": hindcastDate,
       "levtype": "sfc",
       "origin": centre,
       "param": "165",
       "step": "0",
       "stream": "enfh",
       "target": target,
       "time": "00",
       "type": "cf",
})

hindcastYearList = ["2012", "2013"]
hindcastMonthList = ["08", "09"]
hindcastDayList = ["01", "02"]

for hindcastYear in hindcastYearList:
   for hindcastMonth in hindcastMonthList:
       for hindcastDay in hindcastDayList:
           hindcastDate = hindcastYear + hindcastMonth + hindcastDay
               retrieve_data(hindcastDate)