ModuleNotFoundError: No module named 'math'

[Paul White]

Good Morning,

I recently upgraded my server from Debian Stretch to Debian Buster, which changed the version of Python to 3.7. This broke the installation of mod-wsgi, which I knew would happen.

I have now installed mod_wsgi 4.7.1 and successfully ran a minimal python script to prove the installation.

Adding the following to the script causes it to fail:-

import math

This causes the error in the title.

I can successfully import other built in modules such as sys.

I can successfully import math in the python shell and in a script run directly by python3.

Does anybody have any idea what could be going on here?

Thanks

Paul

[Graham Dumpleton]

What is you mod_wsgi configuration?

Are you using a Python virtual environment, or pointing explicitly at a per user site packages directory?

How are you specifying the location of the Python virtual environment?

It looks like you are perhaps mixing things from different Python versions still.

When changing Python version used by mod_wsgi, it can also sometimes help to do a complete stop and start of Apache, not just a reload or restart.

Graham 

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[Paul White]

Hi Graham,

Thanks very much for your answer.

I found a solution; I used your answer here https://github.com/GrahamDumpleton/mod_wsgi/issues/559 by installing your develop.zip and then copied the result of `mod_wsgi-express module-config` into wsgi.so.

This fixed the problem.

Being Debian, there are two versions of python on the server, but using WSGIPythonHome only worked once I installed develop.zip.

Thanks for getting back to me, and thanks for all the work you put into this.

[Graham Dumpleton]

FWIW, you shouldn't need the 'develop' version if on Linux as there are no changes in it that would make any difference compared to installing the latest official tagged version from PyPi.

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