Apart from the change to an IPython.external module, this looks OK.

I suggest we also apply/disable the raise fix, but this can be done later.

Converts raise E, V to raise E(V), and raise E, V, T to raise E(V).with_traceback(T). If E is a tuple, the translation will be incorrect because substituting tuples for exceptions has been removed in Python 3.

Yes, let's keep that for a separate pull request, so the diff doesn't get too big.

Note that the with_traceback(T) bit doesn't work in Python 2.7, so we need to be a little bit careful about applying that fix.

Should #2095 be closed, then?

Never mind, I just saw it had just slipped through the cracks, and closed #2095. Let's continue here.

For the record, I agree with the print_function policy of updating to the py3 style only when >> usage is being made and leaving plain prints alone for a bit longer. Something tells me py3.3 is going to be the 'tipping point' one for the migration, and we can reconsider more aggressive py3 changes at that point.

Merge a commit sent by @bfroehle to apply the raise fix, only in some places on top of this branch.
Are we trying to merge this before SciPy ? Otherwise we might have lots of conflict later...

@Carreau: Maybe you should just squash the last two commits to preserve the history in deathrow/quarantine.

At a glance, this all looks OK. Don't forget to send the exception fix in external.decorators upstream.

Test results for commit 62e140b merged into master
Platform: linux2

• python2.7: OK (libraries not available: oct2py rpy2)
• python3.1: OK (libraries not available: cython matplotlib numpy oct2py pymongo qt rpy2 wx wx.aui zmq)
• python3.2: OK (libraries not available: cython oct2py pymongo rpy2 wx wx.aui)

Not available for testing: python2.6

Forwarded external.decorators upstream: numpy/numpy#353

Thanks. If there are no objections, merge away. I agree that we can squash the last 2 commits.

Up next... next? has_key?

Sounds like a good idea, but let's do another pull request for it.

Squashed and force pushed,
merging.