[ python-Bugs-1475692 ] replacing obj.__dict__ with a subclass of dict

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Bugs item #1475692, was opened at 2006-04-24 20:45
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Category: Python Interpreter Core
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: ganges master (gangesmaster)
Assigned to: Nobody/Anonymous (nobody)
Summary: replacing obj.__dict__ with a subclass of dict

Initial Comment:
>>> class mydict(dict):
...     def __getitem__(self, key):
...         return 17
...
>>> class blah(object):
...     def __init__(self):
...         self.__dict__ = mydict()
...
>>> b = blah()
>>> print b.x
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
AttributeError: 'blah' object has no attribute 'x'

python doesn't call the overriden version of __getitem__.  

i've done several more tests, and the cause to this
problem, afaik, is that the code assumes __dict__ is an
instance of dict, so it directly uses PyDict_GetItem
(or whatever it's called), thus skipping the overriden
method.

python should either disable setting __dict__ to
anything that is not a real dict (type(x) == dict
instead of isinstance(x, dict)), or be willing to call
overriden methods.

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