Attempting to update from python3.5 to python 3.7

[Vysero]

My original reason for updating may be wrong. Originally, I wanted to update because I tried converting a GUI i built in PyQt4 to PyQt5 and I got a strange error:

ImportError: /home/server.com/rob/.local/lib/python3.5/site-packages/PyQt5/QtGui.so: undefined symbol: PySlice_AdjustIndices

I figured this error had to have something to do with the version of python I was using. So I went ahead and tried updating Python via this guide I found: https://www.linuxbabe.com/ubuntu/ins...04-16-10-17-04, method 1.

The conversion worked just fine; however, now I can't seem to figure out how to install modules for 3.7. Pip install only installs modules for 3.5.

On top of that I am starting to think my original error had nothing to do with my version because I have ran across a few posts on SO where people are using PyQt5 with older versions of python like 3.5.

So I guess my question is: How do I install modules so that py3.7 can see and use them?

[Larz60+]

perhaps you should uninstall, and reinstall using a proven method.
See: https://python-forum.io/Thread-Basic-Par...ight=Linux

[Vysero]

perhaps you should uninstall, and reinstall using a proven method. See: https://python-forum.io/Thread-Basic-Par...ight=Linux

Will following that guide make it so that when I do a pip3 install xmodule it installs that module s/t both python3.5.2 and python3.7 will be able to use it?

[Larz60+]

pip must be installed for each python version.
I believe snippsat addresses that (multiple python version) issue.