I thought type-class unification was supposed to mean
that all objects now have a __class__ attribute. But
traceback objects don't seem to:

import sys

try:
  raise ValueError
except ValueError:
  tb = sys.exc_info()[2]
  print tb
  print tb.__class__

results in:

% python2.6 traceback_class.py
<traceback object at 0x82dc8>
Traceback (most recent call last):
  File "traceback_class.py", line 8, in <module>
    print tb.__class__
AttributeError: __class__

--
Greg
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