An example:
#!/usr/bin/env python
import os
from Gaudi.Configuration import *
from Configurables import k4DataSvc
dsvc = k4DataSvc("EventDataSvc", input="simsignal_v01.root")
from Configurables import PodioInput
podioinput = PodioInput("PodioReader", collections=[
"MCParticle",
"VXDCollection",
"ITKBarrelCollection",
"ITKEndcapCollection",
"TPCCollection",
"OTKBarrelCollection",
"OTKEndcapCollection",
"EcalBarrelCollection", "EcalBarrelContributionCollection",
"EcalEndcapsCollection", "EcalEndcapsContributionCollection",
"EcalEndcapRingCollection", "EcalEndcapRingContributionCollection",
"HcalBarrelCollection", "HcalBarrelContributionCollection",
"HcalEndcapsCollection", "HcalEndcapsContributionCollection",
"HcalEndcapRingCollection", "HcalEndcapRingContributionCollection",
"MuonBarrelCollection",
"MuonEndcapCollection"
])
from Configurables import DetSimMixingAlg
evtmixing = DetSimMixingAlg("EvtMixingAlg")
# evtmixing.BackgroundRates = {"testing": 1.0e6}
# evtmixing.BackgroundFileLists = {"testing": ["test.root"]}
evtmixing.BackgroundRates = {"testing": -3460}
evtmixing.BackgroundFileLists = {"testing": ["test-bgsimdose.root"]}
# output
from Configurables import PodioOutput
out = PodioOutput("outputalg")
out.filename = "evtmix_v01.root"
out.outputCommands = ["keep *"]
from Configurables import ApplicationMgr
ApplicationMgr().TopAlg += [podioinput, evtmixing, out]
ApplicationMgr().ExtSvc += [dsvc]
ApplicationMgr().EvtSel = "NONE"
ApplicationMgr().EvtMax = 10
ApplicationMgr().OutputLevel = INFO