get rid of PermutationsNK

[videlec]

The class PermutationsNK in sage.combinat.permutation_nk was only used for its iterative property. The latter can be replaced from the permutations in the itertools Python module.

see also: #10534

CC: @sagetrac-sage-combinat @tscrim @nthiery @hivert

Component: combinatorics

Author: Vincent Delecroix

Branch/Commit: c86ef49

Reviewer: Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/16472

[videlec]

New commits:

4aaf79a

trac #16472: get rid of PermutationsNK

[videlec]

Branch: u/vdelecroix/16472

[videlec]

Commit: 4aaf79a

[videlec]

Description changed:

--- 
+++ 
@@ -1 +1,3 @@
 The class `PermutationsNK` in `sage.combinat.permutation_nk` was only used for its iterative property. The latter can be replaced from the `permutations` in the `itertools` Python module.
+
+see also: #10534

[tscrim]

Changed commit from 4aaf79a to 3c6d532

[tscrim]

comment:3

Hey Vincent, I've added a note about itertools.permutations. If you okay with this change, then positive review.

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New commits:

3c6d532

Review tweaks.

[tscrim]

Changed branch from u/vdelecroix/16472 to public/remove_PermutationsNK-16472

[videlec]

comment:4

Hey Travis,

Replying to @tscrim:

Hey Vincent, I've added a note about itertools.permutations. If you okay with this change, then positive review.

Yes. Makes sense!

Thanks

[videlec]

Reviewer: Travis Scrimshaw