Why did someone write this?

[skip at pobox.com]

    Sandra> try:
    Sandra>    exc_type, exc_value, exc_traceback = sys.exc_info()
    Sandra>    # Do something
    Sandra> finally:
    Sandra>    exc_traceback = None

    Sandra> Why the try/finally with setting exc_traceback to None?

The intent is to decrement the reference count to any objects referenced by
exc_traceback.  Without it, the frame(s) referenced by the traceback remain
alive until exc_traceback goes out of scope.

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