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I originally had Python 3.6 installed and working well with WSGI and Apache2 on my Linux server.

Then I created a Flask app that had a dependency needing Python 3.7. I've successfully (and I think) upgraded to Python 3.9. Running

python3 or sudo python3

both take me to Python 3.9. But then when I run

sudo apt-get install libapache2-mod-wsgi-py3
The following additional packages will be installed: python3, python3.6

it installs Python 3.6

After this, python3 still points to Python 3.9. However, when the WSGI app is run, Python 3.6 is used, and it breaks. I have installed the Python package mod-wsgi with the correct PIP.

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You should be able to control which pytho is used via a simple configuration line. E.g. /etc/httpd/conf.d/your_app.conf with

WSGIPythonHome /opt/your_python_env

(I would advise to also set up an venv dedicated to your app if you aren't already doing so)

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  • But the mod_wsgi doc said the version of python you are pointing via the above setting, should match the version which mod_wsgi is compiled against. So that should not work for chaning the python major/minor version. Am I right?
    – Saleh
    Dec 19, 2021 at 22:11
  • I'm also receiving Invalid command 'WSGIPythonHome' when I check for apachectl -S
    – Ricky Levi
    May 16, 2022 at 6:28
  • @Saleh then in that case, how the command line gives python3.9 but Apache is using python3.8 - how can it be upgraded then (for Apache) because this affects the pip install pkgs, for testing i'm installing with 3.9 but for Apache I need to install it again for 3.8 ?! ... something doesn't make any sense. ( the 3.9 was installed with homebrew, while the system-wide python is in /usr/bin
    – Ricky Levi
    May 16, 2022 at 6:30

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