#8233: concatenation of words should preserve the data type represention when
possible
-----------------------------+----------------------------------------------
Reporter: slabbe | Owner: sage-combinat
Type: enhancement | Status: needs_review
Priority: major | Milestone: sage-4.3.3
Component: combinatorics | Keywords:
Author: | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
-----------------------------+----------------------------------------------
Changes (by slabbe):
* status: new => needs_review
Old description:
> This concerns word represented by str, tuple and list :
>
> {{{
> sage: u = Word(range(10))
> sage: type(u)
> <class 'sage.combinat.words.word.FiniteWord_list'>
> sage: type(u*u)
> <class 'sage.combinat.words.word.FiniteWord_callable_with_caching'>
> }}}
> {{{
> sage: v = Word('asdgadsf')
> sage: type(v)
> <class 'sage.combinat.words.word.FiniteWord_str'>
> sage: type(v*v)
> <class 'sage.combinat.words.word.FiniteWord_callable_with_caching'>
> }}}
> {{{
> sage: v = Word((2,3,5,21,34,6))
> sage: type(v)
> <class 'sage.combinat.words.word.FiniteWord_tuple'>
> sage: type(v*v)
> <class 'sage.combinat.words.word.FiniteWord_callable_with_caching'>
> }}}
New description:
This concerns word represented by str, tuple and list.
1. We want the representation of a concatenation of two words u and v to
be preserved when u and v are of the same data type.
ACTUAL BEHAVIOR:
{{{
sage: u = Word(range(10))
sage: type(u)
<class 'sage.combinat.words.word.FiniteWord_list'>
sage: type(u*u)
<class 'sage.combinat.words.word.FiniteWord_callable_with_caching'>
}}}
{{{
sage: v = Word('asdgadsf')
sage: type(v)
<class 'sage.combinat.words.word.FiniteWord_str'>
sage: type(v*v)
<class 'sage.combinat.words.word.FiniteWord_callable_with_caching'>
}}}
{{{
sage: v = Word((2,3,5,21,34,6))
sage: type(v)
<class 'sage.combinat.words.word.FiniteWord_tuple'>
sage: type(v*v)
<class 'sage.combinat.words.word.FiniteWord_callable_with_caching'>
}}}
2. Moreover, the empty word could be ignored for concatenation :
ACTUAL BEHAVIOR:
{{{
sage: type(Word([]) * Word('asdga'))
<class 'sage.combinat.words.word.FiniteWord_callable_with_caching'>
}}}
INTENDED BEHAVIOR:
{{{
sage: type(Word([]) * Word('asdga'))
<class 'sage.combinat.words.word.FiniteWord_str'>
}}}
--
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8233#comment:1>
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