[Python-Dev] PEP 3142: Add a "while" clause to generator expressions

[Tres Seaver]

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Vitor Bosshard wrote:

>> Some also allow for an "until" keyword.  I'm not suggesting that we
>> need to do this in Python; it's just interesting to note that there is
>> some precedent for this approach.
>>
> 
> Well, you could propose changing the for loop syntax (and by
> extension comprehensions and generators). It's a much more radical proposal, but
> it does keep consistency across the board, which is one of the major
> flaws of the PEP in its current form.
> 
> BTW, there is already an "until" keyword in python, it's called "while not" ;)

'until' is used at least in some languages (Pascal, Modula*, maybe Ada?)
for a "terminate at bottom" loop (one guaranteed to run at least once):
 in such cases, the predicate has the negative sense.


Tres.
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Tres Seaver          +1 540-429-0999          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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