#8119: Rename change the hash value of some objects
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Reporter: hivert | Owner: tbd
Type: defect | Status: positive_review
Priority: major | Milestone: sage-4.7.1
Component: misc | Keywords:
Author: Robert Bradshaw | Upstream: N/A
Reviewer: Florent Hivert, Nicolas M. Thiéry | Merged:
Work_issues: |
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Changes (by jdemeyer):
* milestone: sage-4.7 => sage-4.7.1
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.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:'''
1. [attachment:8119-parent-hash.2.patch]
2. [attachment:8119-parent-hash-review.patch]
--
Comment:
I'm assuming the "apply" should be changed...
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8119#comment:11>
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