[Python-bugs-list] [ python-Bugs-505028 ] Super method search quirk

[noreply@sourceforge.net]

Bugs item #505028, was opened at 2002-01-17 14:14
You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=105470&aid=505028&group_id=5470

Category: Type/class unification
Group: Python 2.2
Status: Open
Resolution: None
Priority: 5
Submitted By: Greg Chapman (glchapman)
Assigned to: Guido van Rossum (gvanrossum)
Summary: Super method search quirk

Initial Comment:
I think the following qualifies as a bug; I think the 
call to super(C, self).m() should cause an exception 
(the super_getattro search should not find the m in A 
if an m is defined in B):

>>> class A(object):
...     def m(self):
...         print 'A'
...
>>> class B(A):
...     m = property(lambda self: 'B')
...
>>> class C(B):
...     def m(self):
...         super(C, self).m()
...         print 'C'
...
>>> c = C()
>>> c.meth()
A
C



----------------------------------------------------------------------

>Comment By: Guido van Rossum (gvanrossum)
Date: 2002-03-22 17:34

Message:
Logged In: YES 
user_id=6380

It would seem a bug, but according to the CVS log it's
intentional. typeobject.c 2.120 introduces an explicit check
that skips data descriptors (such as properties). The
motivation:

- super(C, C()).__class__ would return the __class__
attribute of C()
  rather than the __class__ attribute of the super object. 
This is
  confusing.  To fix this, I decided to change the semantics
of super
  so that it only applies to code attributes, not to data
attributes.
  After all, overriding data attributes is not supported
anyway.

So I think this is a feature after all.


----------------------------------------------------------------------

Comment By: Neil Schemenauer (nascheme)
Date: 2002-03-22 17:27

Message:
Logged In: YES 
user_id=35752

I agree.  This looks like a bug with super().

----------------------------------------------------------------------

You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=105470&aid=505028&group_id=5470