Even if the old python version has been removed, it is possible to use the pip of the current python version with the --path
option to list all the modules installed in the previous version.
For example, migrating all my user installed python modules from 3.7 to 3.8
pip freeze --path ~/.local/lib/python3.7/site-packages > requirements.txt
pip install --user -r requirements.txt
Incidentally, I always use pip install
with --user
and leave the system wide installations to the package manager of my linux distro.