Comment #3 on issue 2608 by vlada.pe...@gmail.com: test_pickling errors under Python 3
http://code.google.com/p/sympy/issues/detail?id=2608
This seems to be related to using the @property decorator (or properties in general) as it's the only common thing between the two errors. It fails on the hasattr() line. Now, the docs for hasattr say this: "(This is implemented by calling getattr(object, name) and seeing whether it raises an exception or not.)" I guess this is then related to raising a custom error and a KeyError rather than an Exception and hence fails. Per the docs the function shouldn't have changed but I'll see the source to be sure.
Another hint towards the above is that the code for the matrices test obviously tries to multiply a 1x3 matrix with a 4x4 one (mgamma(0) from physics somewhere).
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