Hello developers!

As soon as the latest CI passes, I am going to merge a massive code clean up branch to the core's master branch. This integrates flake8 (pyflakes + pep8) static analysis, with a few local customizations.

https://gitlab.com/mailman/mailman/merge_requests/127

One of the most important checks is a customization to enforce our GNU Mailman import style rules, which are codified in the style guide:

https://gitlab.com/mailman/mailman/blob/master/src/mailman/docs/STYLEGUIDE.r...

This branch also updates that style guide.

This merge will cause some churn and if you have merge proposals currently in the queue, it's very possible there will be conflicts. To the extent that you can rebase and push updates, that would be appreciated, but I will not require it as I continue to review outstanding merge proposals. I apologize for any disruption, but with GSoC coming, I want to be sure that to the extent possible, CI will early detect simple style guide violations. That way, reviews can focus more on the actual interesting bits rather than the boring bits.

This branch also bandaids over the problem with the newest Falcon by pinning that package's version to < 1.0. Issue #20 will address a more long-term fix. I plan on releasing core 3.0.3 very soon which will have this fix backported.

There are a few other minor code modernizations, and a local implementation of the idea expressed in this Python bug:

http://bugs.python.org/issue26632

It's been quite the eye-opener to see all the little violations that have crept into the code, but everything will be better now <wink>.

Cheers, -Barry