[Nix-dev] Fwd: Python 3 as default

[Tomasz Czyż]

2017-02-27 15:20 GMT+00:00 Eelco Dolstra <eelco.dolstra at logicblox.com>:

> Hi,
>
> On 02/24/2017 07:54 AM, Freddy Rietdijk wrote:
>
> >> 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?
> >
> > All the packages that explicitly need Python 2 are already pinned to use
> Python
> > 2. That was a matter of converting, testing, and moving on. About 150
> packages
> > were pinned to `python2`. That is why a `python = python3` won't break
> anything
> > (or nearly nothing) in Nixpkgs anymore.
>
> It may silently break external users, though. So removing the "python"
> attribute
> is preferable to aliasing it to "python3".
>
> BTW, I just noticed that the Python 3 package in 17.03 already defines a
> "python
> -> python3" symlink (introduced by [1]). IMHO, we should revert that,
> since it
> can only lead to pointless environment collision errors/warnings. Also, we
> probably don't want to promote the use of the "python" executable name
> because
> it's unversioned (so when Python 4 breaks the language again, we'll have
> to go
> through this whole process again).
>
I agree totally.

>
> [1] https://github.com/NixOS/nixpkgs/commit/708822250e017f0256b0bace5af27a
> 7232e6e1fd
>
> --
> Eelco Dolstra | LogicBlox, Inc. | http://nixos.org/~eelco/
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-- 
Tomasz Czyż
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