#16215: A missing "import" in DiGraph
-------------------------+-------------------------------------------------
Reporter: | Owner:
ncohen | Status: needs_work
Type: | Milestone: sage-6.2
enhancement | Resolution:
Priority: major | Merged in:
Component: graph | Reviewers: Vincent Delecroix
theory | Work issues:
Keywords: | Commit:
Authors: | 7f50072dc0ab7cd38e5a2af14534b4ce012fa9f2
Nathann Cohen | Stopgaps:
Report Upstream: N/A |
Branch: |
u/ncohen/16215 |
Dependencies: |
-------------------------+-------------------------------------------------
Changes (by vdelecroix):
* status: needs_review => needs_work
* reviewer: => Vincent Delecroix
Old description:
> {{{
> sage: Graph([(0,1),(0,1)],multiedges=False)
> ValueError: Non-multigraph input dict has multiple edges (0,1)
> sage: DiGraph([(0,1),(0,1)],multiedges=False)
> ...
> NameError: global name 'choice' is not defined
> }}}
>
> The first message is much clearer `:-P`
>
> Nathann
New description:
{{{
sage: Graph([(0,1),(0,1)],multiedges=False)
Traceback (most recent call last):
...
ValueError: Non-multigraph input dict has multiple edges (0,1)
sage: DiGraph([(0,1),(0,1)],multiedges=False)
Traceback (most recent call last):
...
NameError: global name 'choice' is not defined
}}}
The first message is much clearer `:-P`
Nathann
--
Comment:
Could you instead replace
{{{
choice([v for v in data[u] if data[u].count(v) > 1])
}}}
with
{{{
(v for v in data[u] if data[u].count(v) > 1).next()
}}}
or anything similar. The function `choice` involves some randomness that
is useless here.
--
Ticket URL: <http://trac.sagemath.org/ticket/16215#comment:3>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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