[Python-bugs-list] [ python-Bugs-442791 ] 2.2a1: New style classes and __delitem__

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Bugs item #442791, was opened at 2001-07-19 08:44
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Category: type/class unification
Group: Python 2.2
>Status: Open
Resolution: Fixed
Priority: 5
Submitted By: Walter Dörwald (doerwalter)
Assigned to: Guido van Rossum (gvanrossum)
Summary: 2.2a1: New style classes and __delitem__

Initial Comment:
And another one: New style class don't seem to support 
__delitem__:
----
class Foo(object):
   def __delitem__(self, key):
      print "__delitem__"

del Foo()[42]
----
This results in:
Traceback (most recent call last):
  File "test.py", line 5, in ?
    del Foo()[42]
TypeError: object doesn't support item deletion
----
Changing the base class to dictionary results in:
----
Traceback (most recent call last):
  File "test.py", line 5, in ?
    del Foo()[42]
KeyError: 42
----
but Foo.__delitem__ doesn't seem to be called.


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>Comment By: Guido van Rossum (gvanrossum)
Date: 2001-08-01 15:39

Message:
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user_id=6380

Reopened.  I'll investigate.


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Comment By: Walter Dörwald (doerwalter)
Date: 2001-08-01 11:34

Message:
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user_id=89016

I checked out the descr-branch and it seems that dictionary 
still doesn't support __delitem__:

>>> x = {}
>>> dictionary.__setitem__(x, 1, 1)
>>> x
{1: 1}
>>> dictionary.__delitem__(x, 1)     
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
AttributeError: type object 'dictionary' has no 
attribute '__delitem__'


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Comment By: Guido van Rossum (gvanrossum)
Date: 2001-07-19 09:36

Message:
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user_id=6380

Whoops, you found a whole slew of bugs in this area!

I've fixed this now in the descr-branch of the CVS tree, in
Object/typeobject.c:2.16.8.69.

I've also added a bit to the test suite that checks these
(and slices).

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