Pyhon 2.x or 3.x, which is faster?

[BartC]

On 08/03/2016 01:23, Chris Angelico wrote:
> On Tue, Mar 8, 2016 at 12:00 PM, BartC <bc at freeuk.com> wrote:
>> Yes of course it does. As does 'being slow'. Take another microbenchmark:
>>
>> def whiletest():
>> |   i=0
>> |   while i<=100000000:
>> |   |   i+=1
>>
>> whiletest()
>>
>> Python 2.7:  8.4 seconds
>> Python 3.1: 12.5 seconds
>> Python 3.4: 18.0 seconds
>>
>> Even if you don't care about speed, you must admit that there appears to be
>> something peculiar going on here: why would 3.4 take more than twice as long
>> as 2.7? What do they keep doing to 3.x to cripple it on each new version?
>
> How do your benchmarks compare on this code:
>
> pass

Let me ask you a follow-on question first: how slow does a new Python 
version have to be before even you would take notice?

Compared with 2.7, 3.4 above is spending nearly an extra ten seconds 
doing .... what? I can't understand why someone just wouldn't care.

-- 
Bartc