> I've recently reinstalled Python 2.6 (from DMG) on my Mac, and I am
> running into very strage errors. Namely, logging seems to be badly
> broken. When I open the interpreter through Django's manage.py shell
> and try to use logging, I get the following error:

>>>> logging.critical('ala')
> ------------------------------------------------------------
> Traceback (most recent call last):
>   File "<ipython console>", line 1, in <module>
>   File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
> python2.6/logging/__init__.py", line 1416, in critical
>     root.critical(*((msg,)+args), **kwargs)
>   File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
> python2.6/logging/__init__.py", line 1074, in critical
>     self._log(CRITICAL, msg, args, **kwargs)
>   File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
> python2.6/logging/__init__.py", line 1142, in _log
>     record = self.makeRecord(self.name, level, fn, lno, msg, args,
> exc_info, func, extra)
>   File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
> python2.6/logging/__init__.py", line 1117, in makeRecord
>     rv = LogRecord(name, level, fn, lno, msg, args, exc_info, func)
>   File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
> python2.6/logging/__init__.py", line 272, in __init__
>     from multiprocessing import current_process
>   File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
> python2.6/multiprocessing/__init__.py", line 64, in <module>
>     from multiprocessing.util import SUBDEBUG, SUBWARNING
>   File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
> python2.6/multiprocessing/util.py", line 121, in <module>
>     _afterfork_registry = weakref.WeakValueDictionary()
>   File "/Library/Frameworks/Python.framework/Versions/2.6/lib/
> python2.6/weakref.py", line 51, in __init__
>     UserDict.UserDict.__init__(self, *args, **kw)
> TypeError: unbound method __init__() must be called with UserDict
> instance as first argument (got WeakValueDictionary instance instead)

> I was able to silence the error (and be able to work normally) by
> making UserDict.UserDict inherit from object.

> Any ideas what is causing the error? Before I updated Python
> everything was fine. Am I breaking a lot of things by making
> UserDict.UserDict a new style class?

> Thanks in advance for any insight.

>   -- Ryszard Szopa

>I have a hunch that you are triggering a reload() somewhere. Example:

>Python 2.6.2 (release26-maint, Apr 19 2009, 01:58:18)
>[GCC 4.3.3] on linux2
>Type "help", "copyright", "credits" or "license" for more information.
>>>> import weakref
>>>> weakref.WeakValueDictionary()
><WeakValueDictionary at 140598938447312>
>>>> import UserDict
>>>> reload(UserDict)
><module 'UserDict' from '/usr/lib/python2.6/UserDict.pyc'>
>>>> weakref.WeakValueDictionary()
>Traceback (most recent call last):
>  File "<stdin>", line 1, in <module>
>  File "/usr/lib/python2.6/weakref.py", line 51, in __init__
>    UserDict.UserDict.__init__(self, *args, **kw)
>TypeError: unbound method __init__() must be called with UserDict instance
>as first argument (got WeakValueDictionary instance instead)

>>I have a hunch that you are triggering a reload() somewhere. Example:

>>Python 2.6.2 (release26-maint, Apr 19 2009, 01:58:18)
>>[GCC 4.3.3] on linux2
>>Type "help", "copyright", "credits" or "license" for more information.
>>>>> import weakref
>>>>> weakref.WeakValueDictionary()
>><WeakValueDictionary at 140598938447312>
>>>>> import UserDict
>>>>> reload(UserDict)
>><module 'UserDict' from '/usr/lib/python2.6/UserDict.pyc'>
>>>>> weakref.WeakValueDictionary()
>>Traceback (most recent call last):
>>  File "<stdin>", line 1, in <module>
>>  File "/usr/lib/python2.6/weakref.py", line 51, in __init__
>>    UserDict.UserDict.__init__(self, *args, **kw)
>>TypeError: unbound method __init__() must be called with UserDict instance
>>as first argument (got WeakValueDictionary instance instead)

> Nice sleuthing!  How did you figure that out?