TruthTest.py

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# init application mgr
theApp.initialize()
 
# run 1 event
theApp.nextEvent()
 
# get MC Truth
mcc = PyTruthTools.getMcEvents('GEN_AOD')
 
# get GenEvent
mc = mcc[0]
 
# call a normal method
print (mc.alphaQCD())
 
# get particle-iterators
# GenEvent::particles_begin() and _end() give ietrators
it  = mc.particles_begin()
itE = mc.particles_end()
 
# patch because HepMC::GenEvent::particle_const_iterator doesn't define end()
it.end = mc.particles_end
 
# loop over all particles
while (it != itE):
    # dereference and increment the iterator
    # this corresponds to "p = *it++" 
    p = it.next()
    print (p.pdg_id())
 
# get vertex-iterator
it = mc.vertices_begin()
 
it.end = mc.vertices_end
 
# get GenVertex obj
v = it.next()
 
# loop over all particles connected via a graph
itp  = v.particles_begin()
itpE = v.particles_end(0)
 
itp.end = v.particles_end
 
while (itp != itpE):
    print (itp.next().pdg_id())