#8119: Rename change the hash value of some objects
-------------------------------------------------+--------------------------
Reporter: hivert | Owner: tbd
Type: defect | Status: needs_work
Priority: major | Milestone: sage-4.7.1
Component: misc | Keywords:
Work_issues: | Upstream: N/A
Reviewer: Florent Hivert, Nicolas M. Thiéry | Author: Robert
Bradshaw
Merged: | Dependencies:
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Old description:
> For many objects the hash value is computed from {{{__repr__}}}. This is
> a bad idea since renaming the object change its hash value.
> {{{
> sage: bla = PolynomialRing(ZZ,"x")
> sage: hash(bla)
> -1525918542791298668
> sage: bla.rename("toto")
> sage: hash(bla)
> 2314052222105390764
> }}}
>
> '''Apply:'''
> 1. [attachment:8119-parent-hash.3.patch]
> 2. [attachment:8119-parent-hash-review.patch]
New description:
For many objects the hash value is computed from {{{__repr__}}}. This is a
bad idea since renaming the object change its hash value.
{{{
sage: bla = PolynomialRing(ZZ,"x")
sage: hash(bla)
-1525918542791298668
sage: bla.rename("toto")
sage: hash(bla)
2314052222105390764
}}}
'''Apply Only:'''
1. [attachment:8119-parent-hash-final.patch]
--
Comment(by hivert):
> I'd suggest to just fold it in the other patch.
Done.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8119#comment:15>
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