#9925: Doctest error in sage/graphs/graph.py
---------------------+------------------------------------------------------
Reporter: mpatel | Owner: mvngu
Type: defect | Status: closed
Priority: blocker | Milestone: sage-4.6
Component: doctest | Resolution: worksforme
Keywords: | Author:
Upstream: N/A | Reviewer:
Merged: | Work_issues:
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Comment(by ncohen):
Hmmm..... If ``cycle`` is a boolean, it means it is equal to True (the
method called returns "True", or a certificate that it is not true
otherwise -- a graph object). I have already seen this method to return
wrong answers (and this is fixed in #9420), but the code *IS*
deterministic and in this case I do not understand why you would not get
an error at the previous docstring :
{{{
sage: g.is_even_hole_free()
True
}}}
which uses the same graph. Of course, this doctest is another one of the
kind I'm trying to get rid off these days : it theoretically fails with a
probability of 1/9999999999999999.... which means that it "can happen"...
But once again, this would mean an error at the previous docstring too
`O_o`
if you are finding yourself on one of the machines on which you have seen
it failing, could you give this a try ?
{{{
sage: all( isinstance(graphs.RandomBipartite(10, 10,
.5).is_even_hole_free(certificate = True), "Graph") for i in range(10000)
)
}}}
Nathann
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9925#comment:5>
Sage <http://www.sagemath.org>
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