On 2016-10-12 13:39, Jori Mäntysalo wrote:
         elements = D.topological_sort()

More bikeshedding: in this case, I would even consider ArithmeticError. It's not strictly arithmetic, but it does indicate a mathematical issue. I tend to use ArithmeticError for mathematical errors (something doesn't work because it is mathematically not defined) and ValueError for programming errors (an input which a priori does not make sense).

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