2.2 <-> 2.3 surprise

Roman Suzi rnd at onego.ru
Sat Jun 5 16:26:29 CEST 2004


On Fri, 4 Jun 2004, Michael Hudson wrote:

>Roman Suzi <rnd at onego.ru> writes:
>
>> On Mon, 31 May 2004, Shalabh Chaturvedi wrote:
>>
>> >Roman Suzi wrote:
>> >
>> >> Hi!
>> >>
>> >> I really like python 2.3 but sometimes I write for 2.2 too.
>> >>
>> >> New cool feature of doing:
>> >>
>> >> f = open('file')
>> >> for line in f:
>> >>   do_something(line)
>> >>
>> >> works strange in 2.2: I can't just quit first loop and do:
>> >>
>> >> for line in f:
>> >>   do_some_more(line)
>> >>
>> >> (I as skipping message header by first loop and processing body
>> >> the the second).
>> >>
>> >> In 2.3 it works as intended! Of course, simple refacture made it one loop...
>> >>
>> >>
>> >>
>> >> Sincerely yours, Roman Suzi
>> >
>> >This is probably the following change as described in
>> >http://www.python.org/2.3/highlights.html
>> >
>> >"File objects are now their own iterators. This makes multiple
>> >interrupted iterations over the same file more reliable."
>>
>> Hmmm... Such gradual changes IMHO are worse than just adding something
>> at once. The problem is I was getting no warnings that something is wrong.
>> In some big project this could break a lot.
>
>Are you arguing that the 2.2 behaviour should have been retained? If
>so, you're wrong :-)
.
No. But I think it was too early for 2.2 to have the feature.
It's like having positive number addition in a version 0.1
and fully capable addition in 0.2.

>Cheers,
>mwh
>
>

Sincerely yours, Roman Suzi
-- 
rnd at onego.ru =\= My AI powered by GNU/Linux RedHat 7.3




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