sys._getframe() not behaving as expected

[Skip Montanaro]

    Tim> [Skip Montanaro]
    >> sys._getframe() is acting peculiar.

    Tim> An argument < 0 is treated like 0.  You want to pass 2 and 1, not
    Tim> -2 and -1.

Thanks.  That is the final bit of mortar needed for a small brick wall.  On
python-dev, Gerrit Holl suggested two new builtins: save() and load(), which
would allow a user to save a session and later restore it.  The very
simpleminded implementation of that concept is available at

    http://www.musi-cal.com/~skip/python/save_session.py

Skip