#19108: Implement Python 3 style comparison in the coercion framework
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Reporter: ohanar | Owner:
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.9
Component: coercion | Resolution:
Keywords: | Merged in:
Authors: R. Andrew Ohana | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/ohanar/python3stylecomparison | 168fafb347a6afbdc96cae5bc27a4bea1c22f2e9
Dependencies: | Stopgaps:
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Changes (by ohanar):
* status: needs_review => needs_work
Old description:
> Currently to implement comparison for an element, you either need to
> implement `_cmp_` or `_richcmp_`. For developers accustom to Python 3's
> method of implementing each comparison operator, we should have `_lt_`,
> `_le_`, etc.
>
> Additionally, for most elements where comparison makes sense, there is
> the overwhelming notion that such a comparison is a partial order. Thus
> (unlike in pure python) we should make the default behavior extend the
> provided operators to a partial order (provided enough comparison
> operators are provided).
New description:
Currently to implement comparison for an element, you either need to
implement `_cmp_` or `_richcmp_`. For developers accustom to Python 3's
method of implementing each comparison operator, we should have `_lt_`,
`_le_`, etc.
--
Comment:
Yes, you are right.
Thinking about it a bit more, I think it would make better sense to split
off the partial/total order stuff into metaclasses, I'll split those into
another ticket when I get around it.
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Ticket URL: <http://trac.sagemath.org/ticket/19108#comment:9>
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