Comment #10 on issue 1198 by asmeu...@gmail.com: pickle does not work for Function
http://code.google.com/p/sympy/issues/detail?id=1198

Would it be possible to create a custom pickler that does this, at least for SymPy Live? We already are having to do that for SymPy Live, due to issue 2587 (see https://github.com/sympy/sympy-live/pull/46). This would be only putting a band-aid on the problem, but it would fix bugs in SymPy Live related to this, like:

a = g(x).diff(x)
a
Traceback (most recent call last):
  File "<string>", line 1, in <module>
NameError: name 'a' is not defined

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