#15852: implement Sequence parent from Sets
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Reporter: rws | Owner:
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-6.2
Component: categories | Resolution:
Keywords: | Merged in:
Authors: Ralf Stephan | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Commit:
u/rws/ticket/15852 | c0f4cf53bd33fa88e375a632454a81ce1954a4e1
Dependencies: | Stopgaps:
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Comment (by nthiery):
I am finally looking at this ticket. Thanks for taking care of long
deprecated stuff!
The documentation of `Sequence` states «A mutable list of elements with a
common guaranteed universe, which can be set immutable».
I interpret that as a data structure for an homogeneous collection of
objects, homogeneous in that they share a common universe. This sounds
much more like a programming utility than a model for a mathematical
concept.
So I would tend to not try imposing a mathematical structure onto it: a
sequence needs not have a parent nor a category, nor mathematical
operations like +, ... Let's indeed deprecate/remove the corresponding
methods.
On the other hand, one could triple check that `Sequence` fits nicely in
Python's collection Abstract Base Classes [1]. This is a good start:
{{{
sage: S = Sequence([QQ, RR])
sage: isinstance(S, collections.MutableSequence)
True
}}}
There would remain to check that all methods indeed fit the
specifications.
[1] https://docs.python.org/2/library/collections.html#collections-
abstract-base-classes
Cheers,
Nicolas
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Ticket URL: <http://trac.sagemath.org/ticket/15852#comment:14>
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