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In general it is organised, as a huge tree, with the indentation below, showing different levels down that tree:

• centre (BoM, ECMWF, NCEP, JMA, ...)
  • realtime or reforecast
    •  type of data (control forecast or perturbed forecast)
      • type of level (single level or pressure level or potential  temperature)
        • HindcastDates (20142013-01-01 or 20142013-01-02 or 20142013-01-03, ...)
          •  time-steps
            • members (for perturbed forecast)
              • levels (for pl or pt )
                • parameters

The idea is to request as much data as possible from the same tape file, all time-steps, all members, all parameters for a type of level, a type, a HindcastDate

#!/usr/bin/env python
from ecmwfapi import ECMWFDataServer
server = ECMWFDataServer()
server.retrieve({
    "class": "s2",
    "dataset": "s2s",
    "date": "2014-01-01",
    "expver": "prod",
    "hdate": HindcastDate, (ie the selected HindcastDate eg "2013-09-01"),
    "levelist":"10/50/100/200",  
    "levtype": "pl",
    "origin": "ammc",
    "param": "133/156",
    "step": "24/48/72
    "number": "1/2/3/4/5/",
     "stream": "enfh",
    "target": "CHANGEME",
    "time": "00",
    "type": "pf",
})