Stack Overflow moderator “animuson”

Ethan Furman ethan at
Wed Jul 10 18:18:27 CEST 2013

On 07/10/2013 08:54 AM, Joshua Landau wrote:
> On 10 July 2013 10:00, Steven D'Aprano <steve at> 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:
>> 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()
new_result = sum([SKC1, SKC2, SKC3], my_obj)

Guess what?  You've just changed my_obj.


More information about the Python-list mailing list