#18026: Parent breakage because not every SageObject is idempotent
------------------------+----------------------------
Reporter: vbraun | Owner:
Type: defect | Status: new
Priority: major | Milestone: sage-6.6
Component: pickling | Keywords:
Merged in: | Authors:
Reviewers: | Report Upstream: N/A
Work issues: | Branch:
Commit: | Dependencies:
Stopgaps: |
------------------------+----------------------------
Every !SageObject has a parent by #10962, possibly its own type. But that
doesn't mean that `P(P(x))` returns `P(x)`, or even succeeds:
{{{
sage: Sequence([plot(sin)])
---------------------------------------------------------------------------
TypeError Traceback (most recent call
last)
<ipython-input-4-b6d3f68cd8b4> in <module>()
----> 1 Sequence([plot(sin)])
/home/vbraun/Code/sage.git/local/lib/python2.7/site-
packages/sage/structure/sequence.pyc in Sequence(x, universe, check,
immutable, cr, cr_str, use_sage_types)
293 return PolynomialSequence(x, universe,
immutable=immutable, cr=cr, cr_str=cr_str)
294 else:
--> 295 return Sequence_generic(x, universe, check, immutable, cr,
cr_str, use_sage_types)
296
297
/home/vbraun/Code/sage.git/local/lib/python2.7/site-
packages/sage/structure/sequence.pyc in __init__(self, x, universe, check,
immutable, cr, cr_str, use_sage_types)
498 self.__universe = universe
499 if check:
--> 500 x = [universe(t) for t in x]
501 list.__init__(self, x)
502 self._is_immutable = immutable
TypeError: __init__() takes exactly 1 argument (2 given)
}}}
--
Ticket URL: <http://trac.sagemath.org/ticket/18026>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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