Upgrading python

[Skip Montanaro]

    Stephen> I guess that I had in mind a move from 2.2.2 to 2.2.3. What's
    Stephen> the rule for a minor upgrade like this?

I'd actually be more careful there than if I was just installing 2.3.  I'd
uninstall 2.2.2, then install 2.2.3.  I'd also rummage back through the
folders containing third-party stuff (stuff which winds up in site-packages)
and reexecute

    python setup.py clean
    python setup.py install

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