#12969: Coercion failures in symmetric functions
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Reporter: aschilling | Owner: sage-combinat
Type: defect | Status: needs_review
Priority: major | Milestone: sage-5.3
Component: combinatorics | Resolution:
Keywords: symmetric functions, coercion | Work issues:
Report Upstream: N/A | Reviewers:
Authors: Simon King | Merged in:
Dependencies: | Stopgaps:
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Comment (by SimonKing):
Got it. In sage/structure/parent_old.pyx, which unfortunately is still
involved in `MPolynomialRing_libsingular`, there is line 152:
{{{
sage_type = py_scalar_parent(S)
}}}
However, is S is `<type 'str'>` then its py_scalar_parent is None (which
seems wrong, or if it isn't wrong then one should at least catch the
special case None). The function py_scalar_parent is in
sage/structure/coerce.pyx.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12969#comment:33>
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