Opened 8 years ago
Closed 8 years ago
#7619 closed enhancement (fixed)
Pickling support for finite word defined by callable and iterable
Reported by: | slabbe | Owned by: | slabbe |
---|---|---|---|
Priority: | major | Milestone: | sage-4.3.4 |
Component: | combinatorics | Keywords: | words |
Cc: | saliola | Merged in: | sage-4.3.4.alpha0 |
Authors: | Sébastien Labbé | Reviewers: | Franco Saliola |
Report Upstream: | N/A | Work issues: | |
Branch: | Commit: | ||
Dependencies: | Stopgaps: |
Description
Currently pickling doesn't work for finite word defined by iterator and callable :
sage: w = Word(iter('abcdefghijkl')) sage: loads(dumps(w)) Traceback (most recent call last): ... PicklingError: Can't pickle <type 'generator'>: attribute lookup __builtin__.generator failed
This is not too hard to support. One just have to expand the iterator to a list (or a tuple?) and save the list instead:
sage: w = Word(iter('abcdefghijkl')) sage: loads(dumps(w)) word: abcdefghijkl sage: type(_) <class 'sage.combinat.words.word.FiniteWord_list'>
This is more general solution to the problem solved in #7519.
Attachments (2)
Change History (6)
comment:1 Changed 8 years ago by
- Status changed from new to needs_review
comment:2 Changed 8 years ago by
I just uploaded the patch. Pickle is now supported for infinite word defined from a function :
sage: w = Word(lambda n:n) sage: loads(dumps(w)) word: 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,...
It uses the pickle_function
and unpickle_function
(which gives a new utility for datatype
argument)
sage: lambda n:n <function <lambda> at 0x887e764> sage: pickle_function(_) "csage.misc.fpickle\ncode_ctor\np1\n(I1\nI1\nI1\nI67\nS'|\\x00\\x00S'\np2\n(t(t(S'n'\ntp3\nS'<ipython console>'\np4\nS'<lambda>'\np5\nI1\nS''\ntRp6\n." sage: Word(_, datatype='pickled_function') word: 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,...
Since pickle_function
fails on CallableFromListOfWords
, those finite words are expanded as a list in order to be saved:
sage: w = Word(range(5)) * Word('abcde') sage: type(w) <class 'sage.combinat.words.word.FiniteWord_callable_with_caching'> sage: z = loads(dumps(w)) sage: z word: 01234abcde sage: type(z) <class 'sage.combinat.words.word.FiniteWord_list'>
Needs review!!
comment:3 Changed 8 years ago by
- Keywords words added
- Reviewers set to Franco Saliola
- Status changed from needs_review to positive_review
Hello Sebastien. I've taken a look at the patch. Great changes! We can now pickle objects that we could not have pickled before.
The patch applies cleanly to sage-4.3.3 and all tests passed for make test
.
comment:4 Changed 8 years ago by
- Merged in set to sage-4.3.4.alpha0
- Resolution set to fixed
- Status changed from positive_review to closed
The patch save those finite words to list. I wonder if tuple is better or is the same?