#15862: Mutability of tableaux, for the n-th time
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Reporter: darij | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.2
Component: combinatorics | Resolution:
Keywords: tableaux, sage-combinat, | Merged in:
mutability | Reviewers:
Authors: | Work issues:
Report Upstream: N/A | Commit:
Branch: | Stopgaps:
Dependencies: |
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Comment (by tscrim):
Currently the `_repr_` is used to create the hash for
`CombinatorialObject`. We might be better served storing
`CombinatorialObject` as a tuple instead of a list and just using the
default hash. (Also you can think of `CombinatorialObject` as the
`SageObject` equivalent to a python tuple.)
In regards to #14711 and from what I understand of Simon's comment, it is
about the creation of the parent object `Tableaux()` and is not a slowdown
per-say. More specifically, it's about the weakly referenced `Tableaux()`
parent having to be recreated during Sage's startup since the morphisms
which hold a weak reference to it are being recreated. So once you do hold
a strong reference to `Tableaux()`, it won't be destroyed/recreated (of
course unless you delete the strong reference as well). Moreover, although
the relative value is high, the absolute value is still low so I don't
think it's affecting things much.
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Ticket URL: <http://trac.sagemath.org/ticket/15862#comment:6>
Sage <http://www.sagemath.org>
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