from ROOTaaS.iPyROOT import ROOT
Welcome to ROOTaas Beta
Open a file which is located on the web. No type is to be specified for "f".
f = ROOT.TFile.Open("https://indico.cern.ch/event/395198/material/0/0.root");
Loop over the TTree called "events" in the file. It is accessed with the dot operator. Same holds for the access to the branches: no need to set them up - they are just accessed by name, again with the dot operator.
maxPt=-1
for event in f.events:
maxPt=-1
for track in event.tracks:
pt = track.Pt()
if pt > maxPt: maxPt = pt
if event.evtNum % 100 == 0:
print "Processing event number %i" %event.evtNum
print "Max pt is %f" %maxPt
Processing event number 0 Max pt is 37.588238 Processing event number 100 Max pt is 32.405018 Processing event number 200 Max pt is 34.624805 Processing event number 300 Max pt is 37.022694 Processing event number 400 Max pt is 35.201751 Processing event number 500 Max pt is 35.257848 Processing event number 600 Max pt is 43.020298 Processing event number 700 Max pt is 36.731349 Processing event number 800 Max pt is 34.082705 Processing event number 900 Max pt is 34.757829