WordMorphism: domain/codomain should be sortable if not given

[jdemeyer]

In src/sage/combinat/words/morphism.py, there is the following code:

dom_alph.sort()

and

return FiniteWords(sorted(codom_alphabet))

These will break with #22029.

CC: @videlec

Component: combinatorics

Author: Sébastien Labbé

Branch/Commit: db81e7d

Reviewer: Jeroen Demeyer

Issue created by migration from https://trac.sagemath.org/ticket/26936

[jdemeyer]

comment:1

This one is not trivial. Simply replacing the sorted() by list() gives a lot of doctest failures.

[jdemeyer]

Description changed:

--- 
+++ 
@@ -1,5 +1,12 @@
-This breaks with #22029:
+In `src/sage/combinat/words/morphism.py`, there is the following code:
 
 ```
-        return FiniteWords(sorted(codom_alphabet))
+dom_alph.sort()
 ```
+and
+
+```
+return FiniteWords(sorted(codom_alphabet))
+```
+
+These will break with #22029.

[seblabbe]

comment:3

Does something like this work?

---

New commits:

dbe6670

26936: try sorting

[seblabbe]

Branch: public/26936

[seblabbe]

Commit: dbe6670

[sagetrac-git]

Changed commit from dbe6670 to f146b5e

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

f146b5e

26936: try sorting

[seblabbe]

comment:5

I put except TypeError clauses if I understand #22029 correctly.

[seblabbe]

Author: Sébastien Labbé