[Python-Dev] PEP 351 - do while (original) (raw)

Michael Urman murman at gmail.com
Sun Oct 1 16:14:14 CEST 2006

On 10/1/06, Ron Adam <rrr at ronadam.com> wrote:

(I don't think this has been suggested yet.)

while , :

[snip]

Putting both the entry and exit conditions at the top is easier to read.

I agree in principle, but I thought the proposed syntax already has meaning today (as it turns out, parentheses are required to make a tuple in a while condition, at least in 2.4 and 2.5). To help stave off similar confusion I'd rather see a pseudo-keyword added. However my first candidate "until" seems to apply a negation to the exit condition.

while True until False:  # run once? run forever?
while True until True:  # run forever? run once?

It's still very different from any syntactical syntax I can think of in python. I'm not sure I like the idea.

Michael

Michael Urman http://www.tortall.net/mu/blog

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