#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, Travis
Scrimshaw
Authors: Burcin Erocal | Merged in:
Dependencies: | Stopgaps:
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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.
>
> Apply: [attachment:trac_9016-morphism_hash.patch]
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-morphism_hash.take7.patch]
--
Comment (by burcin):
I attached a new patch replacing the doctests with `hash(f) == hash(f)`
and `{f: 1}[f]` as Robert suggests.
Apply [attachment:trac_9016-morphism_hash.take7.patch].
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/9016#comment:24>
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