eventsfwlite.py

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from __future__ import print_function
from DataFormats.FWLite import Events as FWLiteEvents

from ROOT import gROOT, gSystem, AutoLibraryLoader

print("Loading FW Lite")
gSystem.Load("libFWCoreFWLite");
gROOT.ProcessLine('FWLiteEnabler::enable();')

gSystem.Load("libFWCoreFWLite");
gSystem.Load("libDataFormatsPatCandidates");

from ROOT import gInterpreter
gInterpreter.ProcessLine("using namespace reco;")
gInterpreter.ProcessLine("using edm::refhelper::FindUsingAdvance;")

class Events(object):
    def __init__(self, files, tree_name,  options=None):
        if options is not None :
            if not hasattr(options,"inputFiles"):
                options.inputFiles=files
            if not hasattr(options,"maxEvents"):
                options.maxEvents = 0   
            if not hasattr(options,"secondaryInputFiles"):
                options.secondaryInputFiles = []
            self.events = FWLiteEvents(options=options)
        else :
            self.events = FWLiteEvents(files)

    def __len__(self):
        return self.events.size()

    def __getattr__(self, key):
        return getattr(self.events, key)

    def __getitem__(self, iEv):
        self.events.to(iEv)
        return self