#14214: Cythoned homsets
----------------------------------------------+-----------------------------
Reporter: SimonKing | Owner: tbd
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-5.10
Component: performance | Resolution:
Keywords: Hom, cython, cached method | Work issues: How to store
domain and codomain?
Report Upstream: N/A | Reviewers:
Authors: Simon King | Merged in:
Dependencies: #14159, #12951, #13184 | Stopgaps:
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Comment (by SimonKing):
Apparently it is "new style versus old style classes:
{{{
sage: class Bla(object):
....: @property
....: def _domain(self):
....: return 1
....:
sage: b = Bla()
sage: b._domain
1
sage: b._domain = 3
---------------------------------------------------------------------------
AttributeError Traceback (most recent call
last)
<ipython-input-25-355f52a2815c> in <module>()
----> 1 b._domain = Integer(3)
AttributeError: can't set attribute
sage: b.__dict__['_domain'] = 3
sage: b._domain
1
}}}
versus
{{{
sage: class Bla:
@property
def _domain(self):
return 1
....:
sage: b = Bla()
sage: b.__dict__['_domain'] = 3
sage: b._domain
3
}}}
So, we are stuck.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/14214#comment:39>
Sage <http://www.sagemath.org>
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