In Python 2.3.3, doctest chokes on classes which
contain an attribute of type super: 

Traceback (most recent call last):
  File "/ttt/private/tanzer/temp/confuse_doctest.py",
line 14, in ?
    import doctest, confuse_doctest
  File
"/Node/tttprime/ttt/private/tanzer/temp/confuse_doctest.py",
line 15, in ?
    doctest.testmod(confuse_doctest)
  File "/usr/lib/python2.3/doctest.py", line 1148, in
testmod
    f, t = tester.rundict(m.__dict__, name, m)
  File "/usr/lib/python2.3/doctest.py", line 908, in
rundict
    f2, t2 = self.__runone(value, name + "." + thisname)
  File "/usr/lib/python2.3/doctest.py", line 1069, in
__runone
    return self.rundoc(target, name)
  File "/usr/lib/python2.3/doctest.py", line 828, in rundoc
    f2, t2 = self.run__test__(d, name)
  File "/usr/lib/python2.3/doctest.py", line 937, in
run__test__
    raise TypeError("Tester.run__test__: values in "
TypeError: Tester.run__test__: values in dict must be
strings, functions, methods, or classes; <super: <class
'A'>, NULL>

A simple example triggering the bug is attached.

Python 2.3.3 (#2, Jan 13 2004, 00:47:05) 
[GCC 3.3.3 20040110 (prerelease) (Debian)] on linux2

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I patched doctest.py to avoid the traceback (see attached
patch-file). I'm not sure if this is the right place to fix
the bug, though. Maybe inspect.classify_class_attrs should
be changed instead?

The second chunk of the patch improves the traceback given
by doctest by giving the name of the offending dict-item.

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The problem is that inspect.get_class_attrs()'s "method" 
classification is a bit hetergeneous: it contains methods, 
and any method descriptors *except* classmethod and 
staticmethod.  The proposed patch will fix behavior for 
super(), but not for any other method descriptors.  So 
perhaps it would be better to explicitly test "_isfunction(v) 
or _ismethod(v)" rather than "not isinstance(value, 
super)".

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This got fixed as part of the massive doctest refactoring for 
2.4.  I have no plan to backport any of that to the 2.3 line.