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2011年6月4日 Soren Hansen <report@bugs.python.org>:
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> Soren Hansen <soren@linux2go.dk> added the comment:
>
> When I first investigated this problem (I reported the original bug on Launchpad), my first attempt to address this issue in pymox had me quite stumped. The class in question has a __getattr__ method. Up until now, this hasn't affected the use of dir(), but it does now. I really just wanted it return whatever it used to return (since that has worked so far), but realising that this was an old-style class, I couldn't just call super(TheClass, self).__dir__().
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> So my question is: If this change stays (which seems clear given that the only changes proposed here are ways of relaxing the type requirement of the __dir__ method's return value, not reverting the change altogether), and I have an old-style class with a __getattr__ defined, how do I make that class return whatever it would have usually returned for __dir__()?
Yes, this is a limitation of magic methods on old style classes. The
usual method is something like this:
 def __getattr__(self, name):
 if name == "__dir__":
 return self.__dir__
 # Other stuff
Of course, the best fix is to use new-style classes. :)