Comment #2 on issue 2608 by asmeurer: test_pickling errors under Python 3 http://code.google.com/p/sympy/issues/detail?id=2608
For an introduction to pickling, watch this video from pycon 2011. http://python.mirocommunity.org/video/4296/pycon-2011-everything-you-want. That will give you the basic idea of what it does. It doesn't explain much about to make custom objects serializable. For that, you will just have to read the docs.
It would also help if you added a print statement so that we could see what protocol it fails under.
Also, modify it to run under all protocols (instead of short-circuiting when it fails) so we can see exactly which ones fail and which don't.
And by the way, you might as well add protocol 3 to the tests in Python 3, as long as you are fixing picking errors.
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