Inside konsole, you can use different shells. Some common ones are bash, fish, and zsh. The deck comes with all three of those installed by default.

You can usually tell which one you’re using by either looking at the title bar of konsole when you first open it (should say something like ~:bash – Konsole) or by running the command echo $SHELL

Once you’ve confirmed you’re using bash, run which python (or which python3). Outside of the venv you should see the command return /usr/bin/python

After you run your source command, run which python again. You should now see that the python location being run has changed to be inside the venv folder.