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Date: Wed, 10 Jul 2013 09:18:27 -0700
From: Ethan Furman <ethan@stoneleaf.us>
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Subject: Re: Stack Overflow moderator =?UTF-8?B?4oCcYW5pbXVzb27igJ0=?=
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On 07/10/2013 08:54 AM, Joshua Landau wrote:
> On 10 July 2013 10:00, Steven D'Aprano <steve@pearwood.info> wrote:
>> On Wed, 10 Jul 2013 07:55:05 +0000, Mats Peterson wrote:
>>
>>> A moderator who calls himself “animuson” on Stack Overflow doesn’t want
>>> to face the truth. He has deleted all my postings regarding Python
>>> regular expression matching being extremely slow compared to Perl.
>>
>> That's by design. We don't want to make the same mistake as Perl, where
>> every problem is solved by a regular expression:
>>
>> http://neilk.net/blog/2000/06/01/abigails-regex-to-test-for-prime-numbers/
>>
>> so we deliberately make regexes as slow as possible so that programmers
>> will look for a better way to solve their problem. If you check the
>> source code for the re engine, you'll find that for certain regexes, it
>> busy-waits for anything up to 30 seconds at a time, deliberately wasting
>> cycles.
>
> I hate to sound like this but do you realise that this is exactly what
> you're arguing for when saying that sum() shouldn't use "+="?

my_obj = SomeKoolClass()
my_obj.modify_in_some_kool_way()
new_result = sum([SKC1, SKC2, SKC3], my_obj)

Guess what?  You've just changed my_obj.

--
~Ethan~