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Tue Jan 14 22:17:02 CET 2014 · https://mail.python.org/pipermail/python-dev/2014-January/131553.html

On 14/01/2014 20:54, Guido van Rossum wrote:
> On Tue, Jan 14, 2014 at 12:13 PM, Ethan Furman <ethan at stoneleaf.us> wrote:
>
>> In Py2, because '%15s' can actually take 17 characters, I have to use '%15s'
>> % data_value[:15] everywhere.
>
> Wow. I thought there would be some combination using %.15s but I can't
> get that to work. :-(
>

I believe you wanted this.

 >>> a='01234567890123456'
 >>> len(a)
17
 >>> b = '%15.15s' % a
 >>> b;len(b)
'012345678901234'
15

-- 
My fellow Pythonistas, ask not what our language can do for you, ask 
what you can do for our language.

Mark Lawrence

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[Python-Dev] PEP 460 reboot