Expected behaviour

In accordance to #1538 (#1731 #1734 and #1715) we should default to Python 3 for wiki pages.
This would mean default to using python3 and pip3 as long as the respective versionless commands are not aliased to them in most major distributions.

Actual behaviour

The wiki does not mentions Python 3 as the default case for usage

Misc

We would need to look through all wiki pages manually.
When doing so I think would be a good time to switch to using Pythons venv in examples as I sometimes experienced a few problem installing this module globally...