Hi Simon,
> Another data point: In your example above, one has
> sage: 'sum' in dir(R)
> True
> sage: R.__dict__['sum']
>
> ---------------------------------------------------------------------------
> KeyError Traceback (most recent call
> last)
>
> /home/king/<ipython console> in <module>()
>
> KeyError: 'sum'
>
> So, introspection seems to be seriously screwed up.
>
> R has both a __getattr__ and a __dir__ method that seem to be rather
> generic. Is this part of the combinat/category framework? So, my
> uneducated guess is that R belongs to a category whose objects
> *should* provide a sum method, but nobody has implemented it (though
> "sum" sounds like there could be generic code for it as well).
One remark to support your guess:
sage: R._test_category()
---------------------------------------------------------------------------
AssertionError Traceback (most recent call last)
/usr/local/sage/sage-4.4.2/local/lib/python2.6/site-packages/Sphinx-0.6.3-py2.6.egg/sphinx/<ipython
console> in <module>()
/usr/local/sage/sage/local/lib/python2.6/site-packages/sage/structure/parent.so
in sage.structure.parent.Parent._test_category (sage/structure/parent.c:4730)()
/usr/local/sage/sage/local/lib/python/unittest.pyc in failUnless(self, expr,
msg)
323 def failUnless(self, expr, msg=None):
324 """Fail the test unless the expression is true."""
--> 325 if not expr: raise self.failureException, msg
326
327 def failUnlessRaises(self, excClass, callableObj, *args, **kwargs):
AssertionError: category of self improperly initialized
Cheers,
Florent
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