logilab-constraint #2825 combinations recipe [open]
In the code of Expression, we have a version that does the same thing (I think so) as http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/496807 but that is less elegant for generating the parameters affectations passed to the expression. Investigate to see if it is really the same thing. If so, benchmark and if it's more effective, replace.
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