Prefer Python 3

Goal description

This goal comprises all the changes required to accelerate Python 3 support in Debian. Packages that support both python2 and python3 should have python3 build variants enabled and package. Applications that embed and support either python 2 or 3, should prefer python 3 runtime.

Current status

• TODO

How to help

• File bugs against packages that don't have python3-* package, yet the code does support python3
• Fix above bugs
• In case of embedded interpreters, switch to python3 where possible

Next Milestone

• TODO