CMSSW_4_4_3_patch1/src/PhysicsTools/PythonAnalysis/examples/MCTruth2.py

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from PhysicsTools.PythonAnalysis import *
from ROOT import *

# prepare the FWLite autoloading mechanism
gSystem.Load("libFWCoreFWLite.so")
AutoLibraryLoader.enable()

# access the event tree
events = EventTree("generatorOutput.root")

# event loop
for event in events:
    genEvent = event.VtxSmeared.GetEvent()
    print genEvent