sympy/sympy-bot — pull request #82 by asmeurer (2011-12-20 11:14:44+00:00)
Title: Copy py3k-sympy

Automatically copy py3k-sympy when the `--reference` option is given.

This makes running the tests in Python 3 **way** faster if you have already run `./bin/use2to3` in the reference directory, because it will just have to run 2to3 on those files that the pull request changed (and those that changed since you last ran 2to3, so it's good to just run that often, to keep things up-to-date).

You can explicitly disable this with the `--py3k-no-copy` option, which can also be set in the config file.

For those running tests automatically on servers (@Krastanov and @certik), I recommend adding some kind of cron job to run use2to3 on your local SymPy periodically, to keep this fast.