Set up CMSSW and copy the ntuplizer
cmsrel CMSSW_7_3_0 cd CMSSW_7_3_0/src cmsenv mkdir EXOVVNtuplizerRunII cd EXOVVNtuplizerRunII mkedanlzr Ntuplizer cd Ntuplizer scram b
Config is in python/ConfFile_cfg.py. To run
cmsRun python/ConfFile_cfg.py
For interactive computing
ipython python/ConfFile_cfg.py
Example code can be found in
/shome/jngadiub/EXOVVAnalysis_bkup/CMSSW_5_3_13/src/EXOVVNtuplizer