#16397: Symbolic cmp
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Reporter: vbraun | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.4
Component: symbolics | Resolution:
Keywords: | Merged in:
Authors: | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/rws/symbolic_cmp | af5f800fdc616022d503b5e845ec81ebfef7c25e
Dependencies: | Stopgaps:
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Comment (by vbraun):
The problem is IMHO what to do with Python 3. Sure we can play the two
different comparisons (cmp vs. rich) in Python 2 against each other, but
in Py3 there will be only one comparison. So either
* Comparison is always symbolic, and sorting will have to call `__bool__`
on the symbolic inequalities. Slow and we then need to make that a total
order instead of returning `False` all the time. Slow.
* Comparison is never symbolic, and you need to call `x.symbolic_less(y)`.
Could be beautified by the preparser. The actual comparison returns the
internal term order. Fast.
Thought? Maybe that topic is more fodder for sage-devel...
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Ticket URL: <http://trac.sagemath.org/ticket/16397#comment:10>
Sage <http://www.sagemath.org>
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