At Sage Days a new developer we're onboarding decided to look at some
code in Sage and ran into this:
if sum([G.is_directed(), H.is_directed()]) == 1:
raise ValueError("One graph can not be directed while the
other is not.")
This is line 551 of src/sage/graphs/generic_graph_pyx.pyx:
https://github.com/sagemath/sage/blame/master/src/sage/graphs/generic_graph_pyx.pyx#L551
It seems to be equivalent to
if G.is_directed() != H.is_directed():
raise ValueError("One graph can not be directed while the
other is not.")
Frankly, I'm really embarrassed about this code. What do you guys think?
-- William
--
William (http://wstein.org)
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