On 07/10/2013 08:54 AM, Joshua Landau wrote:
On 10 July 2013 10:00, Steven D'Aprano <st...@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~
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