[MERGE] Add exit() on progressbars from TestUIFactory

[Robert Collins]

On Tue, 2009-03-17 at 12:26 +1100, Martin Pool wrote:
> 
> Firstly, I saw in some existing code that while you cannot do
> try/finally in python2.4, you apparently can do
> 
> try:
>   stuff
> except e:
>   finish()
>   raise
> else:
>   finish()
> 
> ... which is so close to try/finally one really wonders why they
> thought it was impossible, but anyhow.  It does mean that you cannot
> just 'return' from inside the try block to finish the function, but
> rather you have to arrange to exit it through the bottom, and there is
> some risk of a bug if you forget to do so.
>
> This has the advantage that all the code to do with the pb is inside
> the generator function.

It has the disadvantage that it doesn't work :(.

Python simply fails to tell you that it won't.

-Rob

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