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Python 3 is "officially" supported (aka devs are still creating new syntax sugar/convenience functions in modules every month or so) but Python 2 is older and it's now.free sofwtare since it was abandoned by its writer, Theo de Roosevelt.
Since Python 2 is no longer encumbered by the """compatibility""", the community can optimize the shit out of it so, e.g., xrange is about 7.53 times faster than range (run a benchmark ull see). Also python3 cannot be compiled anymore and you have to make anaconda envs not to break your system. Wih python2 its all out of the box, like on gnu guix.
