On 2005-12-06, Steve Holden wrote:
> Daniel Schüle wrote:
>> hi,
>>
>> [...]
>>
>>
>>>># pseudo code
>>>>i=2
>>>>lst=[i**=2 while i<1000]
>>>>
>>>>of course this could be easily rewritten into
>>>>i=2
>>>>lst=[]
>>>>while i<1000:
>>>> i**=2
>>>> lst.append(i)
>>>>
>>>
>>>
>>>Neither of these loops would terminate until memory is exhausted. Do you
>>>have a use case for a 'while' in a list comprehension which would
>>>terminate?
>>
>>
>> unless I am missing something obvious, I can not see why the loop should
>> not terminate
>
> In that case, kindly explain how the condition i<1000 can become false
> when it starts at 2 and never changes! [In other words: you *are*
> missing something obvious].
What does i**=2 do if not change i?
>>> i=2
>>> lst=[]
>>> while i<1000:
... i**=2
... lst.append(i)
...
>>> lst
[4, 16, 256, 65536]
--
Chris F.A. Johnson, author | <http://cfaj.freeshell.org>
Shell Scripting Recipes: | My code in this post, if any,
A Problem-Solution Approach | is released under the
2005, Apress | GNU General Public Licence
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