2.2 features

[Skip Montanaro]

    Paul> For example, this would be illegal:

    Paul>    except x not in class ZeroDivisionError:

But this would be a common construct I think.  You often don't want
SystemExit and KeyboardInterrupt caught, so I think it would be useful to be
able to have

    except x not in clas SystemExit, KeyboardInterrupt:

when you want a mostly catchall except.

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