Python 3.9 to 3.10 validation and cleanup

[Kevin77]

Broke my system following this piece of advice in the Announcement post.

@philm

sudo pip freeze > pip_list_sudo.txt
pip freeze --user > pip_list_user.txt
/path/to/<venv_name>/python -m pip freeze -l > pip_list_<venv_name>.txt

@philm

After the upgrade, although they say to do something like
sudo pip install -r pip_list_sudo.txt,