Python: No module named 'root'

[FearoftheDark]

When I try to import root on python3 I get the error:
ModuleNotFoundError: No module named 'root'

I compiled root from source by using

cmake -DCMAKE_INSTALL_PREFIX=/opt/ROOT -DPYTHON=ON -Dpyroot=ON -DPYTHON_EXECUTABLE=/usr/bin/python3.8 ..

While configuring it said found python

in my config file it says:

BUILDPYTHON    := yes
PYTHONLIBDIR   := /usr/lib/x86_64-linux-gnu
PYTHONLIB      := /usr/lib/x86_64-linux-gnu/libpython3.8.so
PYTHONINCDIR   := $(filter-out /usr/include, /usr/include/python3.8)
PYTHONLIBFLAGS :=
PYTHONEXE      :=

I sourced the ROOTSYS to my ~/.bashrc
I also added root/lib to my PYTHONPATH
When I do root-config --has-python it says no
When I do root-config --features it says:

cxx14 asimage builtin_afterimage builtin_clang builtin_gl2ps builtin_llvm builtin_lz4 builtin_lzma builtin_nlohmannjson builtin_openui5 builtin_tbb builtin_vdt builtin_xrootd builtin_xxhash builtin_zstd clad dataframe exceptions fftw3 fitsio gdml http imt mathmore mlp mysql opengl pyroot roofit webgui root7 runtime_cxxmodules shared ssl tmva tmva-cpu tmva-pymva spectrum vdt x11 xml xrootd

I’m not sure if it has anything to do with my problem but after the installation I had an error when I run root:
It was something like … file doesn’t exist in /opt/ROOT/etc/…
When I checked that directory that file was there but etc directory didn’t have permission for user and other. So I gave permission with: sudo chmod -R a+rx etc
Then root started to work.

Also in libraries I try to find libpyroot but it doesn’t exist.

Here is my make output:
make.out.txt (950.6 KB)

There is no other ROOT installation in my PC this is my first time installing ROOT to this pc.

ROOT Version:6.23/01
Platform: Xubuntu 20.04

[Wile_E_Coyote]

root-config --has-pyroot # "pyroot" in ROOT 6 was "python" in ROOT 5

BTW. Regardless of the version, the python’s module is named “ROOT”, not “root”.

[FearoftheDark]

it is yes

[FearoftheDark]

I tried with both root and ROOT, both doesn’t work

[Wile_E_Coyote]

You MUST use EXACTLY the same Python version (and the same compiler) that your ROOT binaries were built for (otherwise, expect mysterious crashes anywhere, anytime):

root-config --python-version # C/C++ calling python ;
root-config --python2-version # python 2 calling C/C++ ;
root-config --python3-version # python 3 calling C/C++ ;

BTW. Remember to “source /the/location/of/ROOT/bin/thisroot.sh” to add your ROOT executables and libraries to your environment (when ROOT is not installed in some “standard” system locations, like “/usr/[bin|lib]” or “/usr/local/[bin|lib]”).

[FearoftheDark]

Now it worked with sourcing like that directly. I thought adding

export ROOTSYS=/opt/ROOT
export PATH=$ROOTSYS/bin:$PATH
export LD_LIBRARY_PATH=$ROOTSYS/lib/:$LD_LIBRARY_PATH

to .bashrc is the same thing as source. It is my noobness. Thank you for your time and help.

[FearoftheDark]

However I still don’t understand root-config --has-python says no. And also why I don’t have libpyroot.