[Python-Dev] Python 2.x and 3.x use survey, 2014 edition

[Brett Cannon]

Mark, your tone is no longer constructive and is hurting your case in
arguing for anything. Please take it down a notch.

On Tue Dec 16 2014 at 1:48:59 PM Mark Roberts <wizzat at gmail.com> wrote:

> On Tue, Dec 16, 2014 at 2:45 AM, Antoine Pitrou <solipsis at pitrou.net>
> wrote:
>>
>> Iterating accross a dictionary doesn't need compatibility shims. It's
>> dead simple in all Python versions:
>>
>> $ python2
>> Python 2.7.8 (default, Oct 20 2014, 15:05:19)
>> [GCC 4.9.1] on linux2
>> Type "help", "copyright", "credits" or "license" for more information.
>> >>> d = {'a': 1}
>> >>> for k in d: print(k)
>> ...
>> a
>>
>> $ python3
>> Python 3.4.2 (default, Oct  8 2014, 13:08:17)
>> [GCC 4.9.1] on linux
>> Type "help", "copyright", "credits" or "license" for more information.
>> >>> d = {'a': 1}
>> >>> for k in d: print(k)
>> ...
>> a
>>
>> Besides, using iteritems() and friends is generally a premature
>> optimization, unless you know you'll have very large containers.
>> Creating a list is cheap.
>>
>
> It seems to me that every time I hear this, the author is basically
> admitting that Python is a toy language not meant for "serious computing"
> (where serious is defined in extremely modest terms). The advice is also
> very contradictory to literally every talk on performant Python that I've
> seen at PyCon or PyData or ... well, anywhere. And really, doesn't it
> strike you as incredibly presumptuous to call the *DEFAULT BEHAVIOR* of
> Python 3 a "premature optimization"? Isn't the whole reason that the
> default behavior switch was made is because creating lists willy nilly all
> over the place really *ISN'T* cheap? This isn't the first time someone has
> tried to run this line past me, but it's the first time I've been fed up
> enough with the topic to call it complete BS on the spot. Please help me
> stop the community at large from saying this, because it really isn't true
> at all.
>
> -Mark
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