Python 2.7 deprecation task list

[Kwpolska]

• Have @ralsina switch his virtualenv to Python 3.4 or better
• Add deprecation warning to v7.7.2 (Add 2.7 deprecation warning #2121)
• Switch flake8/pep257 checking to Python 3.5
• Switch invariance testing to Python 3.5
• Switch all remaining infrastructure (plugins site auto-build→(server is now Ubuntu 16.04, not blocked)
• Figure out how to get -py3-only wheels: drop universal setting from setup.cfg
• Clean up AUR packages (python-nikola → nikola; python2-nikola → /dev/null)
• Unpin doit version
• Write post-mortem (in 2017 maybe)

[Kwpolska]

Tried invariance. For now, charts and RSS are untestable, because they are using dicts. We can probably just delete charts from invariance. But RSS feeds are a bigger problem, because we can’t fix that. Maybe we could migrate to feedgenerator instead of using PyRSS2Gen, which is ancient?

[ralsina]

@Kwpolska I don't understand the comment about charts and RSS?

[Kwpolska]

@ralsina It’s our friend, invariance testing. Charts and RSS feeds (pygal and pyrss2gen, that is) implement some things as dicts. Which have random order when printing on Python 3. And you can guess how well this works with diff.

[ralsina]

I am +1 for switching to feedgenerator or whatever. pygal I guess we could disable when in invariance mode? Just monkeypatch the directive into repeating the source text or something like it.

[Kwpolska]

I added charts.txt it to the excluded files list, so pygal’s not a problem.

So, we have to figure out how to work with feedgenerator and use it.

[msnoigrs]

I have already ported to feedgenerator in my private repository. FYI

[Kwpolska]

We’d love a pull request then.

[msnoigrs]

There are two caution points for using my feedgenerator-based code so far.

1. It use my custom feedgenerator that contains some bugfixes and some enhancements. https://github.com/masayuko/python-feedgen
2. The code is designed to prevent as little conflict as possible in order to make it easier to merge into the original nikola. So it need a few adjustments for PR.

[ralsina]

All in all, this seems done. Agree @Kwpolska? If yes, let's close it.

[Kwpolska]

Yes, it is all done. Closing.