Comment #2 on issue 2204 by [email protected]: Unpickling a Singleton doesn't return the singleton object
http://code.google.com/p/sympy/issues/detail?id=2204

Pickling of new-style classes with __getnewarg__ only works in protocol 2 and higher.

aa = pickle.loads(pickle.dumps(S.Pi, -1))

Pickles using the highest protocol version available

aa is pi
True

I suppose this should be documented somewhere.

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