#8475: Pickling of _python_object_alphabet is broken.
-------------------------------+--------------------------------------------
Reporter: hivert | Owner: hivert
Type: defect | Status: positive_review
Priority: major | Milestone: sage-4.3.4
Component: combinatorics | Keywords: pickling nested classes
Author: Florent Hivert | Upstream: N/A
Reviewer: Sébastien Labbé | Merged:
Work_issues: |
-------------------------------+--------------------------------------------
Changes (by slabbe):
* status: needs_review => positive_review
* reviewer: => Sébastien Labbé
Comment:
BEFORE:
{{{
sage: W = Words()
sage: A = W.alphabet()
sage: A
Python objects
sage: Z = loads(dumps(W))
sage: B = Z.alphabet()
sage: B
Python objects
sage: A is B
True
sage: W is Z
False
sage: W == Z
True
sage: loads(dumps(A))
Traceback (most recent call last):
...
PicklingError: Can't pickle <class
'sage.combinat.words.words._python_object_alphabet'>: attribute lookup
sage.combinat.words.words._python_object_alphabet failed
sage: loads(dumps(B))
Traceback (most recent call last):
...
PicklingError: Can't pickle <class
'sage.combinat.words.words._python_object_alphabet'>: attribute lookup
sage.combinat.words.words._python_object_alphabet failed
}}}
AFTER with the patche applied:
{{{
sage: W = Words()
sage: A = W.alphabet()
sage: A
Python objects
sage: Z = loads(dumps(W))
sage: B = Z.alphabet()
sage: B
Python objects
sage: A is B
True
sage: W is Z
False
sage: W == Z
True
sage: loads(dumps(A))
Python objects
sage: loads(dumps(B))
Python objects
}}}
Hence, the problem described in this ticket is fixed by the patch.
Moreover, all tests passed in the sage tree. Positive review.
Note to the release manager : this patch commutes with the one at #8429.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8475#comment:2>
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