Comment #3 on issue 2518 by asmeurer: Problems with default variable definitions in live.sympy.org
http://code.google.com/p/sympy/issues/detail?id=2518
This was pushed in, and it all seems to work now:
x
x
f(x)
f(x)
a = 1
a = 1
... b = 2
a
1
b
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