#11943: The category graph should comply with Python's method resolution order
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Reporter: SimonKing
| Owner: nthiery
Type: enhancement
| Status: needs_work
Priority: major
| Milestone: sage-4.7.3
Component: categories
| Keywords: category graph, method resolution
order
Work_issues: Preserve super_categories etc. as methods, but introduce a lazy
attribute _super_categories | Upstream: N/A
Reviewer:
| Author: Simon King
Merged:
| Dependencies: #11900
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Comment(by SimonKing):
I think the following model is best for preserving backwards
compatibility:
* If one wants to provide the super categories of a category, one should
implement a method super_categories() - this is what one would currently
do.
* There is a new lazy attribute _super_categories defined for the base
class of categories. That lazy attribute calls the method
super_categories(). Of course, calling the method happens only once, so
that the speed is acceptable.
* In all ''applications'', the method call super_categories() shall be
replaced by getting the attribute _super_categories. That is explained in
a note to the developers in the documentation of super_categories.
* There is a lazy attribute _all_super_categories and
_all_super_categories_proper, and there is still a method
all_super_categories(proper=False). The method returns the appropriate
lazy attribute, and the documentation of the method states that one should
better use the lazy attributes.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11943#comment:11>
Sage <http://www.sagemath.org>
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