[SOLVED] Upgraded Python: Module no longer found

[Winfried]

Hello,

After upgrading Python from 3.12.0 to 3.13.1, and manually editing Windows' PATH (otherwise, it still ran the previous version)… Python can no longer find a module that was available before:

ModuleNotFoundError: No module named 'ebooklib'

Why is that, and what's the fix?

Thank you.

--
Edit:
For others' benefit, here's the fix:

pip3 freeze --path c:\Users\joe\AppData\Local\Programs\Python\Python312\Lib\site-packages\ > python_requirements.txt
pip3 install -r python_requirements.txt

At least by default, looks like the Python installer doesn't take care of reinstalling the packages :-/

But it failed installing this package (possibly more, since the process doesn't ignore and proceed with the other modules):

Collecting Pillow==10.0.1 (from -r python_requirements.txt (line 59))
  Downloading Pillow-10.0.1.tar.gz (50.5 MB)
     ---------------------------------------- 50.5/50.5 MB 2.2 MB/s eta 0:00:00
  Installing build dependencies ... done
  Getting requirements to build wheel ... error
  error: subprocess-exited-with-error

  × Getting requirements to build wheel did not run successfully.
  │ exit code: 1
  ╰─> [21 lines of output]
…
note: This error originates from a subprocess, and is likely not a problem with pip.

Looks like upgrading Python is a bit more involved that I naïvely thought.

--
Edit: With too many modules not compatible with the latest Python, I edited Windows' user PATH to go back.

But, while "python --version" does say 3.12.0… a module I use no longer works :-/

"ModuleNotFoundError: No module named 'ebooklib'"

Why does the module no longer load? Don't modules live in c:\Users\joe\AppData\Local\Programs\Python\Python312\Lib\site-packages\, and thus aren't affected by upgrading Python?

How do I go back to the working Python?

--
Edit: Besides not having the modules re-installed as part of the upgrade, and some modules being incompatible… the Py launcher used 3.13.1, causing the error. Re-running the installer to remove 3.13.1 solved the problem.

[Larz60+]

You can use pyenv
Should you decide to install, you can use any version of python that is installed using pyenv.
Also take a look this local thread.