#9362: Invalidate None as a vertex label.
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Reporter: boothby | Owner: jason, mvngu, ncohen, rlm
Type: defect | Status: needs_info
Priority: major | Milestone:
Component: graph theory | Keywords: sd35.5
Work_issues: | Upstream: N/A
Reviewer: | Author:
Merged: | Dependencies: #11739
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Comment(by brunellus):
BTW: I'm not sure how slow is exception handling in Python, but isn't it
little unfortunate that this is used so extensively in the add_edge
function? Every call add_edge((u, v)) raises an exception that is
immediately caught.
{{{
sage: G=Graph(multiedge=True)
sage: timeit("G.add_edge(1, 2)")
625 loops, best of 3: 8.21 µs per loop
sage: timeit("G.add_edge((1, 2))")
625 loops, best of 3: 12.2 µs per loop
}}}
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9362#comment:8>
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