"reraise" & Exception Transformation (was Re: Modules implicitly exposing exceptions from other modules)

[Aahz Maruch]

In article <14506.62171.965245.972734 at anthem.cnri.reston.va.us>,
Barry A. Warsaw <bwarsaw at cnri.reston.va.us> wrote:
>
>def baz():
>    try:
>        bar()
>    except NameError:
>        tpe, val, tb = sys.exc_info()
>        raise AttributeError, None, tb

I recall reading that passing around a traceback object leaks memory.
Does this particular idiom avoid that trap?
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