#14772: Remove CombinatorialClass from Permutations
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Reporter: tscrim | Owner: sage-combinat
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-5.11
Component: combinatorics | Resolution:
Keywords: days49 | Merged in:
Authors: Travis Scrimshaw | Reviewers:
Report Upstream: N/A | Work issues:
Branch: | Dependencies: #8386 #14519 #14808
Stopgaps: |
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Old description:
> Part of #12913.
New description:
Part of #12913.
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Apply: [attachment:trac_14772-remove_cc_permutations-ts.patch]
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Comment (by tscrim):
I hacked around it:
{{{
if n > 0:
return iter(PatternAvoider(self, self._p))
return iter([self.element_class(self, [])])
}}}
it's a python issue that putting a yield in the function makes it into a
generator, which can't return anything at all, including iterators. This
makes sense because python a priori doesn't know that it will be an
iterator; plus the can of worms whether it should continue the iteration
from that point with that iterator.
All combined and back to you Darij.
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Ticket URL: <http://trac.sagemath.org/ticket/14772#comment:42>
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