Comment #17 on issue 1026 by asmeurer: pypy doesn't run sympy http://code.google.com/p/sympy/issues/detail?id=1026
That's interesting that PyPy doesn't enforce that, because we'd like to create an In object that lets you do In(x, Y) == x in Y (Y would be some Set object), but we can't in CPython due to the boolean return value limitation (which exists for no reason, btw).
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