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To: python-list@python.org
From: Peter Otten <__peter__@web.de>
Subject: Re: A curious bit of code...
Date: Thu, 13 Feb 2014 22:06:31 +0100
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Xref: csiph.com comp.lang.python:66242

Chris Angelico wrote:

> On Fri, Feb 14, 2014 at 7:55 AM, Emile van Sebille <emile@fenx.com> wrote:
>> On 2/13/2014 11:59 AM, Zachary Ware wrote:
>>>
>>> In a fit of curiosity, I did some timings:
>>
>>
>> Snip of lots of TMTOWTDT/TIMTOWTDI/whatever... timed examples :)
>>
>> But I didn't see this one:
>>
>> s[::len(s)-1]
> 
> .... AAAAAAAAAAAAAAAAAAARGGGGGGGGGGHHHH!
> 
> Really, I actually did pause, double-take, and then scream under my
> breath, when I saw that. Yes, it works. But please, if you EVER do
> this, save me the trouble and just submit your code to thedailywtf.com
> straight away!

For the record:

>>> s = "x"
>>> s[::len(s)-1]
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: slice step cannot be zero