#17890: Remove _(rich)cmp_c_impl
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Reporter: jdemeyer | Owner:
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-6.6
Component: cython | Resolution:
Keywords: | Merged in:
Authors: Jeroen Demeyer | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/jdemeyer/ticket/17890 | 17bd067153ad40ced061147390687f514a7f7cba
Dependencies: | Stopgaps:
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Comment (by vdelecroix):
Replying to [comment:30 jdemeyer]:
> Replying to [comment:27 vdelecroix]:
> > - comparison involving coercion is '''wrong''': if you call
{{{cmp(a,b)}}} with `a` and `b` between two parents `A` and `B` and a
coercion `B -> A` then `Element.__richcmp__` is called instead of
`Element.__cmp__`.
> >
> > Actually, this is not only a bug in Python
> Bug or feature?
Call it whatever you want: `cmp(a1,a2)` (same type) calls `__cmp__` but
`cmp(a,b)` (different types) does not and use `__richcmp__` instead. The
consequence is that you might perform three times the coercion while
calling `cmp` with elements with different parents!
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Ticket URL: <http://trac.sagemath.org/ticket/17890#comment:34>
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