And a copy for the list as well + a one person applause for our friend, reply-all.
---------- Forwarded message ---------- From: Herwig Hochleitner <hhochleit...@gmail.com> Date: 2017-02-24 4:54 GMT+01:00 Subject: Re: [Nix-dev] Python 3 as default To: Freddy Rietdijk <freddyrietd...@fridh.nl> First off, for context: I'm very grateful for your work to get our python stuff over to python3. I also support python3 providing `/bin/python`, _if_ we ensure that python2's `/bin/python` takes precedence in all collisions (right until python2's EOL). I think the PEP's symlinking guideline doesn't directly apply here, since our transitive dependencies don't collide (horray!). I'm against changing pkgs.python to mean python3, though. Let me break down why: 2017-02-22 16:32 GMT+01:00 Freddy Rietdijk <freddyrietd...@fridh.nl>: > > > If we can't break stuff we might as well not make any changes at all. I see your point, but I'd like to point out that additive changes are less cumbersome than breaking changes, and explicit breakage is less cumbersome than implicit breakage. > the fact that upstream wants everyone to move away from Python 2 to be fair, upstream has been wanting that for a decade > > incompatibilities also exist between minor versions i think users are customarily expected to keep up with point releases. > explicitly changing parameters and arguments ... considering how much Python > is used throughout Nixpkgs that's just unrealistic. > > I'm still open to getting rid of the `python` attribute, ... If this is the > route we want to take, then its very unlikely we will be able to switch to > 3.5 as the default for 17.03, I'd be happy to help with the process of mass-renaming, if somebody provided a list of packages wanting 2 or 3, however I suspect the real work is in determining those package sets. So, if a query-replace for `pkgs.python` -> `pkgs.python2` / `pkgs.python3` within nixpkgs would cause so much trouble, how would a rename in `all-packages.nix` fare any better? Are we ready to throw the switch yet? > or 3.6 for 17.09. Are there python projects, stuck at 3.5, as well? kind regards _______________________________________________ nix-dev mailing list nix-dev@lists.science.uu.nl http://lists.science.uu.nl/mailman/listinfo/nix-dev
