#8119: Rename change the hash value of some objects
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Reporter: hivert | Owner: tbd
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.0
Component: misc | Resolution:
Keywords: | Work issues: fix on 32-bit
Report Upstream: N/A | Reviewers: Florent Hivert, Nicolas M.
Thiéry
Authors: Robert Bradshaw | Merged in:
Dependencies: | Stopgaps:
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Changes (by nborie):
* status: needs_work => needs_review
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 Only:'''
> 1. [attachment:8119-parent-hash-final.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-fix32.patch]
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8119#comment:21>
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