Comment #4 on issue 2684 by [email protected]: Deepcopy does not work on evaluate False
http://code.google.com/p/sympy/issues/detail?id=2684
Actually, there's a simple workaround for your use case: make deepcopy() return the object itself (by setting Basic.__deepcopy__ = lambda self, memo: self). Cf. https://github.com/rlamy/sympy/tree/2684_hack
Note that it's not a complete solution as it doesn't do anything about pickling.
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