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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