#11255: Enhance the e_one_star.Patch class
-----------------------------+----------------------------------------------
Reporter: tjolivet | Owner: sage-combinat
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.7.1
Component: combinatorics | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author: Timo Jolivet
Merged: | Dependencies:
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Comment(by slabbe):
> The only thing that bugs me is that we have to create a whole iterable
to pick a single element of a Patch: the best way I can think of is
{{{list(P)[0]}}}. Using {{{random.choice}}} is of course overkill, and
there is no {{{frozenst.pick_arbitrary}}} method (which would be nice...).
To get the first element, you can do:
{{{
sage: S = set(range(10))
sage: next(iter(S)) # or equivalently: iter(S).next()
0
}}}
To get the i-th element:
{{{
sage: from itertools import islice
sage: next(islice(iter(S), 7, None))
7
}}}
I look at your patch and review it soon. Je crois bien qu'on y est
maintenant!
Sébastien
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11255#comment:17>
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