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

def retrieve_BoM_reforecast():
'''
   A function to demonstrate how to iterate efficiently over all hincastYears, hincastMonths etc
''' 
    hindcastYearStart = 1981
    hindcastYearEnd = 2013
    hindcastMonthStart = 1
    hindcastMonthEnd = 12
    hincastDatesList = ["01", "06", "11", "21", "26"]

    for hindcastYear in list(range(hindcastYearStart, hindcastYearEnd + 1)):
        for hindcastMonth in list(range(hindcastMonthStart, hindcastMonthEnd + 1)):
            numberOfDays = calendar.monthrange(hindcastYear, hindcastMonth)[1]
            for hindcastDay in hincastDatesList:
                hindcastDate = '%04d%02d%s' % (
                    hindcastYear, hindcastMonth, hindcastDay)
                BoM_reforecast_request(hindcastDate)

def BoM_reforecast_request(hindcastDate):
'''
   A BoM reforecast requests. Change the keywords below to adapt it to your needs.
'''
 modelVersionDate = "2014-05-01"
    target = "data_s2s_%s.grb" % (hindcastDate)
    server.retrieve({
        "class": "s2",
        "dataset": "s2s",
        "date": modelVersionDate,
        "expver": "prod",
        "hdate": hindcastDate, 
        "levtype": "pl",
        "levelist": "500/700/850/925/1000",
        "origin": "ammc",
        "param": "130/156",
        "step": "24/to/720/by/24",
        "stream": "enfh",
        "target": "data.pf.sfc"target,
        "time": "00",
        "number": "1/2/3",
        "type": "pf", 
    })

if __name__ == '__main__':
    retrieve_BoM_reforecast()