Python 2 to 3 conversion - embrace the pain

[Steven D'Aprano]

Mark Lawrence wrote:

> On 15/03/2015 20:59, Fetchinson . wrote:
>> On 3/15/15, Mark Lawrence <breamoreboy at yahoo.co.uk> wrote:
>>> On 15/03/2015 19:05, John Nagle wrote:
>>>> On 3/14/2015 1:00 AM, Marko Rauhamaa wrote:
>>>>> John Nagle <nagle at animats.com>:
>>>>>>     I'm approaching the end of converting a large system from Python
>>>>>>     2
>>>>>> to Python 3. Here's why you don't want to do this.
>>>>>
>>>>> A nice report, thanks. Shows that the slowness of Python 3 adoption is
>>>>> not only social inertia.
>>>>> Marko
>>>>
>>>>       Thanks.
>>>>
>>>>       Some of the bugs I listed are so easy to hit that I suspect those
>>>> packages aren't used much.  Those bugs should have been found years
>>>> ago.  Fixed, even.  I shouldn't be discovering them in 2015.
>>>>
>>>>       I appreciate all the effort put in by developers in fixing these
>>>> problems.  Python 3 is still a long way from being ready for prime
>>>> time, though.
>>>>
>>>> John Nagle
>>>>
>>>
>>> This https://python3wos.appspot.com/ says differently.
>>
>> A "package supporting python 3" is not equivalent to a "package not
>> introducing new bugs in its python 3 version relative to python 2" and
>> is also not equivalent to a "package working without issues on python
>> 3".
>>
>> Cheers,
>> Daniel
>>
>>
> 
> So the packages increase their test coverage as the bugs get discovered
> and fixed.  Or are you saying that a mere nine years isn't a long enough
> time period to do an exercise like this?


Mark, did you read John's post or just respond with a knee-jerk defence of
Python 3? I quote:

"Some of the bugs I listed are so easy to hit that I suspect those
packages aren't used much.  Those bugs should have been found years
ago.  Fixed, even.  I shouldn't be discovering them in 2015."

Clearly a mere nine years is NOT long enough. Which is probably why the
Python core developers are supporting Python 2 until 2020. Library authors
will presumably be offering Python 2 compatibility for even longer.



-- 
Steven