#7519: Allowing the choice of word datatype for images under WordMorphism
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Reporter: slabbe | Owner: slabbe
Type: enhancement | Status: new
Priority: major | Milestone: sage-4.3
Component: combinatorics | Keywords:
Work_issues: | Author:
Upstream: N/A | Reviewer:
Merged: |
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By default, the image of a word under a morphism is given by a iterator
which is good because it is returned in constant time but which is bad
because it is not directly picklable.
{{{
sage: m = WordMorphism({0:[0,1], 1:[1,0,0,1]})
sage: print m
WordMorphism: 0->01, 1->1001
sage: W = m.domain()
sage: w = W([0,1,1,1])
sage: type(w)
<class 'sage.combinat.words.word.FiniteWord_list'>
sage: z = m(w)
sage: type(z)
<class 'sage.combinat.words.word.FiniteWord_iter_with_caching'>
sage: loads(dumps(z))
Traceback (most recent call last):
...
PicklingError: Can't pickle <type 'generator'>: attribute lookup
__builtin__.generator failed
}}}
This patch allows one to suggest under which datatype to represent the
word :
{{{
sage: m = WordMorphism({0:[0,1], 1:[1,0,0,1]})
sage: z = m([0,1,1,1], datatype='list')
sage: type(z)
<class 'sage.combinat.words.word.FiniteWord_list'>
sage: loads(dumps(z))
word: 01100110011001
}}}
It also leaves the current default behavior :
{{{
sage: m = WordMorphism({0:[0,1], 1:[1,0,0,1]})
sage: m([0,1,1,1])
word: 01100110011001
sage: type(_)
<class 'sage.combinat.words.word.FiniteWord_iter_with_caching'>
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7519>
Sage <http://www.sagemath.org>
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