#8800: Doctest coverage of categories
--------------------------+-------------------------------------------------
Reporter: SimonKing | Owner: Simon King
Type: defect | Status: new
Priority: major | Milestone: sage-4.4.1
Component: categories | Keywords: categories doctests
Author: Simon King | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
--------------------------+-------------------------------------------------
Comment(by SimonKing):
Next bug:
{{{
sage: F = QQ['x'].construction()[0]
sage: F
Poly[x]
sage: F == IdentityFunctor(Rings())
False
sage: IdentityFunctor(Rings()) == F
True
}}}
This is since the cmp method of ``IdentityFunctor_generic`` only checks
whether domain and codomain coincide, but doesn't check the type of the
functor.
Even worse, comparison it may raise an error - how unpythonic!
{{{
sage: IdentityFunctor(Rings()) == QQ
---------------------------------------------------------------------------
AttributeError Traceback (most recent call
last)
/home/king/SAGE/patches/doku/english/<ipython console> in <module>()
/home/king/SAGE/sage-4.3.1/local/lib/python2.6/site-
packages/sage/categories/functor.so in
sage.categories.functor.ForgetfulFunctor_generic.__cmp__
(sage/categories/functor.c:1429)()
/home/king/SAGE/sage-4.3.1/local/lib/python2.6/site-
packages/sage/structure/parent.so in
sage.structure.parent.Parent.__getattr__ (sage/structure/parent.c:5064)()
/home/king/SAGE/sage-4.3.1/local/lib/python2.6/site-
packages/sage/structure/parent.so in
sage.structure.parent.getattr_from_other_class
(sage/structure/parent.c:2738)()
/home/king/SAGE/sage-4.3.1/local/lib/python2.6/site-
packages/sage/structure/parent.so in
sage.structure.parent.raise_attribute_error
(sage/structure/parent.c:2610)()
AttributeError: 'RationalField_with_category' object has no attribute
'domain'
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/8800#comment:4>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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