#14006: Bug with dumps of hasse diargams
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Reporter: VivianePons | Owner: VivianePons
Type: defect | Status: new
Priority: major | Milestone: sage-5.7
Component: combinatorics | Resolution:
Keywords: Hasse_diagrams, poset | Work issues:
Report Upstream: N/A | Reviewers:
Authors: | Merged in:
Dependencies: | Stopgaps:
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Description changed by VivianePons:
Old description:
> The call of the _rank_function of a hasse diagrams breaks the dumps
> method of the object because of a nasty implementation of a cached
> parameter. (I suppose it's an old stuff that should be changed to
> lazy_attribute or something similar)
>
> {{{
>
> sage: P = Poset()[[BR]]sage: H = P._hasse_diagram[[BR]]sage: s =
> dumps(H) [[BR]]sage: H.rank_function()[[BR]]<built-in method
> !__getitem!__ of dict object at 0x8a3ecec>[[BR]]sage: s =
> dumps(H)[[BR]]Traceback (most recent call last)[[BR]]...[[BR]]!TypeError:
> expected string or Unicode object, !NoneType found[[BR]]}}}
New description:
The call of the _rank_function of a hasse diagrams breaks the dumps method
of the object because of a nasty implementation of a cached parameter. (I
suppose it's an old stuff that should be changed to lazy_attribute or
something similar)
{{{
sage: P = Poset()
sage: H = P._hasse_diagram
sage: s = dumps(H)
sage: H.rank_function()
<built-in method __getitem__ of dict object at 0x8a3ecec>
sage: s = dumps(H)
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
...
TypeError: expected string or Unicode object, NoneType found
}}}
--
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14006#comment:1>
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