python 2.6 indicates this error whilst running a script that works fine under Python 2.5.

Exception RuntimeError: 'maximum recursion depth exceeded in __subclasscheck__' in <type 'exceptions.AttributeError'> ignored


I suppose this must be related to some kind of isinstance or issubclass check, but how can I locate the problem if no traceback is shown?

Googling seems to indicate that __subclasscheck__ is an abstract base class method, but clearly in 2.5 I cannot mess with abc stuff.
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Robin Becker
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