At 12:58 PM 10/1/2006 -0400, Andrew Koenig wrote:
> > (I don't think this has been suggested yet.)
> >
> > while <enter_condition>, <exit_condition>:
> > <body>
>
>This usage makes me uneasy, not the least because I don't understand why the
>comma isn't creating a tuple. That is, why whould
>
> while x, y:
> <body>
>
>be any different from
>
> while (x, y):
> <body>
>
>?
>
>My other concern is that <exit_condition> is evaluated out of sequence.
This pattern:
while entry_cond:
...
and while not exit_cond:
...
has been suggested before, and I believe that at least one of the times it
was suggested, it had some support from Guido. Essentially, the "and while
not exit" is equivalent to an "if exit: break" that's more visible due to
not being indented.
I'm not sure I like it, myself, but out of all the things that get
suggested for this issue, I think it's the best. The fact that it's still
not very good despite being the best, is probably the reason we don't have
it yet. :)
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