#12601: @cached_method does not work for special methods
------------------------+---------------------------------------------------
Reporter: saraedum | Owner: jason
Type: defect | Status: new
Priority: minor | Milestone: sage-5.0
Component: misc | Keywords: cached_method, cache, operator,
special method
Work_issues: | Upstream: Reported upstream. Little or no
feedback.
Reviewer: | Author:
Merged: | Dependencies:
------------------------+---------------------------------------------------
Caching does not work for the {{{~}}} operator.
{{{
sage: class A(object):
... @cached_method
... def __invert__(self):
... return 1
sage: a = A()
sage: ~a is ~a
False
}}}
Also the value of {{{a.__invert__}}} changes when calling {{{~a}}}.
This happens because special methods are called through the type and not
the actual instance for new-style classes:
http://docs.python.org/release/2.7.2/reference/datamodel.html?highlight=data%20model
#special-method-lookup-for-new-style-classes
As of 5.0.beta4 no operators in sage use {{{@cached_method}}}.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12601>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
--
You received this message because you are subscribed to the Google Groups
"sage-trac" group.
To post to this group, send email to [email protected].
To unsubscribe from this group, send email to
[email protected].
For more options, visit this group at
http://groups.google.com/group/sage-trac?hl=en.
