Comment #1 on issue 1942 by asmeurer: Refactor the singleton mechanism http://code.google.com/p/sympy/issues/detail?id=1942
I haven't looked at it too much, but +1 for the change to sympy/core/__init__.py. I was just trying to figure out where oo was being imported from the other day, and I couldn't find it because of that exec statement.
Also, we noticed on IRC yesterday that the docstring for SingletonFactory (SingletonRegistry) is wrong (it might be in your logs if you keep them, I think you were online). It states "E.g. S.Exp == C.Exp()", but actually, it doesn't do this. A better one would be S.One == C.One(). And it should be an actual doctest.
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