[Rivet] rivet Python module could not be loaded

[Andy Buckley]

On 17/11/16 12:24, Shehu S AbdusSalam wrote:
> Hi Andy,
>
> How can I correct this annoying thing?
>
> ./local/bin/rivet
> The rivet Python module could not be loaded: is your PYTHONPATH set
> correctly?
>
>
> From python,
> import rivet
> returns
>
> ../local/lib/python2.7/site-packages/rivet/core.so: undefined symbol:
> PyUnicodeUCS4_DecodeUTF8
>
> The directory /local/lib/python2.7/site-packages/
> is in the PYTHONPATH.

Hi Shehu,

Hmm, that is strange. That missing symbol is obviously from Python 
itself, yet it's Python that's claiming it can't find it. Are you 
attempting to run Rivet with the same Python version that was used to 
build it?

Testing a little more, I googled for PyUnicodeUCS4_DecodeUTF8 and found 
this as the first result:

https://stackoverflow.com/questions/16871799/trying-to-import-a-module-undefined-symbol-pyunicodeucs4-decodeutf8

"""
The module was built against a Python that was built with UCS-4 as its 
internal unicode representation. Your Python was built with UCS-2 as its 
internal representation. Rebuild the module, or rebuild Python.
"""

That's not proof, but does back up the hypothesis that the Rivet module 
is not being run with the same version of Python that its library was 
built against.

Andy

-- 
Dr Andy Buckley, Lecturer / Royal Society University Research Fellow
Particle Physics Expt Group, University of Glasgow