[Python-3000] else-clause on for-loops

[Fredrik Lundh]

Steven Bethard wrote:

> There was talk previously_ about removing the else clause on for-loops
> (and while-loops).  One possibility would be to change the else-clause
> to behave as expected above (i.e. only executed when the loop fails to
> iterate over any items).

I'm well aware that Python 3000 doesn't aim to be backwards compatible,
but I would prefer if we could refrain from subtly changing the behaviour
of existing constructs in way that breaks all existing use, and makes it un-
necessarily hard to convert old code (whether by hand or by machine).

(fwiw, the else statement in Python *always* means the same thing: exe-
cute this when the controlling condition has been tested and found false)

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