One of my top priorities has been to port Mailman 3 (core) to Python 3. This work is now complete, and ready to be merged into trunk. No doubt bugs still lurk, but at least the entire test suite is passing. My intent is to merge this to trunk and do another beta release before the end of the year.
If you want to take a look at the branch, try this: $ bzr branch lp:~barry/mailman/py3 The diff is available online via the merge proposal: https://code.launchpad.net/~barry/mailman/py3/+merge/245313 It's a big diff. $ bzr diff . --old ../3.0 | diffstat -s 166 files changed, 1881 insertions(+), 1538 deletions(-) Python 3.4 will be the minimum required version. (It make work with earlier Python 3's but I will not officially support anything earlier.) There are a few things to keep an eye out for, especially if you are currently experimenting with Mailman 3 in production: * A few database columns have changed from LargeBinary to Unicode. I have not yet figured out how to add the Alembic schema migrations to handle this, but I'll do so before the release. * The internal format of the requests table has changed. While the column type is a string, the internal format was a sort of home baked pickle-like format. This turned out to be incompatible with Python 3, due to some assumptions made about the format. I've changed this to using a JSON representation, which is safe and platform independent. This means that any held requests (subscriptions, unsubscriptions, held posts) must be cleared before switching to the Python 3 code. I don't think it's worth trying to migrate this internal format. * The new email API in Python 3 is really wonderful, but I am mostly not yet taking advantage of it. The one area that required a significant rewrite is in the Subject prefix munging code. Some Python 2 behavior is different in Python 3 and the old algorithms had to be rewritten. I've added a lot of tests, but there are probably bugs in the new code, especially when various mixed charsets appear in the Subject header. Please do test, review, grouse, compliment, curse, rejoice, and enjoy. Over the holidays I'll spend some time cleaning a few things up (especially the documentation), then I'll merge this to trunk and do a 3.0b5 release as a Python 3-only application. Mailman 3 will not be bilingual so Python 2 support will be dropped. Cheers, -Barry
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