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Root in python3


Dear experts,
I when I do (1) I have the error message (2). When I do it with python2, it works fine. I’m doing that on cern (lxplus machine). Is it normal?


>>>import ROOT


Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ModuleNotFoundError: No module named 'ROOT


It is normal if you use the default ROOT5 installation on lxplus.
It will work if you leverage LCG releases, for example sourcing LCG93:

source /cvmfs/sft.cern.ch/lcg/views/LCG_93python3/x86_64-slc6-gcc7-opt/setup.sh

The description of the ecosystem these releases provide is described here.