#9016: make morphisms hashable
---------------------------------+------------------------------------------
Reporter: burcin | Owner: AlexGhitza
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.6
Component: categories | Resolution:
Keywords: | Work issues:
Report Upstream: N/A | Reviewers: Robert Bradshaw
Authors: Burcin Erocal | Merged in:
Dependencies: | Stopgaps:
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Changes (by burcin):
* status: needs_info => needs_review
Old description:
> Attached patch makes morphisms hashable in a reasonably fast way by
> defining the following:
>
> {{{
> def __hash__(self):
> return hash((self._domain, self._codomain))
> }}}
>
> It also defines specialized methods for
> `sage.rings.morphism.RingHomomorphism_im_gens` and
> `sage.rings.morphism.RingHomomorphism_from_quotient`.
>
> While testing the code for `im_gens`, I fixed a confusing error message
> in `sage.structure.sequence.Sequence.__hash__()` as well.
New description:
Attached patch makes morphisms hashable in a reasonably fast way by
defining the following:
{{{
def __hash__(self):
return hash((self._domain, self._codomain))
}}}
It also defines specialized methods for
`sage.rings.morphism.RingHomomorphism_im_gens` and
`sage.rings.morphism.RingHomomorphism_from_quotient`.
While testing the code for `im_gens`, I fixed a confusing error message in
`sage.structure.sequence.Sequence.__hash__()` as well.
Apply: [attachment:trac_9016-morphishm_hash.take4.patch]
--
Comment:
Thanks for reviewing this ticket!
New patch up at [attachment:trac_9016-morphishm_hash.take4.patch] with
32-bit hash values. I removed the `# indirect doctest` messages as well.
Perhaps the coverage script improved in the mean time to avoid complaints
about not using the name of the function in the tests.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9016#comment:15>
Sage <http://www.sagemath.org>
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