How to move all modules to new version of Python (from 3.6 to 3.7)

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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.

It is safer to re-install all packages due to possible compatibility issues:

pip3.6 list | awk '{print $1}' | xargs -I{} pip3.7 install {}

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