[Python-Dev] PEP 315 - do while

[Fuzzyman]

Nick Coghlan wrote:

>Hans Polak wrote:
>  
>
>>Ok, I see your point. Really, I've read more about Python than worked with
>>it, so I'm out of my league here.
>>
>>Can I combine your suggestion with mine and come up with the following:
>>
>>      do:
>>          <setup code>
>>          <loop body>
>>          while <condition>
>>      else:
>>          <loop completion code>
>>    
>>
>
>In my example, the 3 sections (<setup code>, <loop body> and <loop completion 
>code> are all optional. A basic do-while loop would look like this:
>
>       do:
>           <setup code>
>           while <condition>
>
>(That is, <setup code> is still repeated each time around the loop - it's 
>called that because it is run before the loop evaluated condition is evaluated)
>  
>

+1

This looks good.

The current idiom works fine, but looks unnatural :

while True:
    if <condition>:
       break

Would a 'while' outside of a 'do' block (but without the colon) then be
a syntax error ?

'do:' would just be syntactic sugar for 'while True:' I guess.

Michael Foord
http://www.voidspace.org.uk

>Cheers,
>Nick.
>
>  
>