#14065: Element overrides python behavior of cmp
------------------------------------+---------------------------------------
Reporter: tscrim | Owner: sage-combinat
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.7
Component: combinatorics | Resolution:
Keywords: Element, cmp | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Travis Scrimshaw | Merged in:
Dependencies: #14052 | Stopgaps:
------------------------------------+---------------------------------------
Description changed by tscrim:
Old description:
> As part of #12913, we are adding inheritance from `Element` to many
> classes that inherit from `CombinatorialObject`. However, there are many
> functions are relying on a valid call to `cmp`, but `Element` overrides
> this. This patch is a fix which implements a basic `__cmp__` for
> `CombinatorialObject` for the switch.
New description:
As part of #12913, we are adding inheritance from `Element` to many
classes that inherit from `CombinatorialObject`. However, there are many
functions are relying on a valid call to `cmp`, but `Element` overrides
this. This patch is a fix which implements a basic `__cmp__` for
`CombinatorialObject` for the switch.
Another issue this ticket does is add a `__nonzero__()` to
`CombinatorialObject` so things like `if p:` and `not p` will work when
also inheriting from `Element` (which checks against the
`Parent().zero_element()` and is not implemented for all parents).
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14065#comment:3>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at http://groups.google.com/group/sage-trac?hl=en.
For more options, visit https://groups.google.com/groups/opt_out.
