#9362: Invalidate None as a vertex label.
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Reporter: boothby | Owner: jason, mvngu, ncohen, rlm
Type: defect | Status: new
Priority: major | Milestone:
Component: graph theory | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies:
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Comment(by dsm):
It definitely makes sense to forbid None as a vertex label. add_vertex(),
which it makes sense to think of as the fundamental spec, already forbids
the use of None, both explicitly in the docstring ("cannot be None") and
implicitly in practice because it uses the default None to mean "next
unused integer". So that you can sneak it in as one through a back
channel is a bad thing given the widespread use of None as a special
value, just like the OP says.
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9362#comment:3>
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