Here is the code for is_isomorphic() on class FinitePoset:
if hasattr(other,'hasse_diagram'):
return . . .
else:
raise ValueError('The input is not a finite poset.')
So for example Posets.PentagonPoset().is_isomorphic("Hello everyone!")
gives the error message as it should.
But why the code doesn't directly check that `other` is of type
FinitePoset? In theory there could be some other structure using hasse
diagram at back. Is there some rationale behind this?
--
Jori Mäntysalo
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