[Zope-dev] implementing zope.component 4.0

[Wichert Akkerman]

On 11/30/09 13:43 , Hanno Schlichting wrote:
> On Mon, Nov 30, 2009 at 1:21 PM, Martin Aspeli<optilude+lists at gmail.com>  wrote:
>> Martijn Faassen wrote:
>>> This implies we don't want to release zope.component 4.0 for a long time
>>> yet.
>>
>> I think the answer should be "never". :)
>
> I think never is a rather long time. I'd suggest we think about these
> changes more in the timeline of years.
>
> Looking at Python itself or Zope's own former deprecation policies, it
> seems that policies where we deprecate / warn about API changes in one
> release and change behavior it one or two releases after that seem to
> work. They do rely on their being something like a coherent release of
> some language / framework / toolkit though. And they rely on these
> releases being made at an interval of at minimum a year or preferably
> 18 months (as in Python's case).
>
> I think that once we get a ZTK 1.0 release out that promises to be
> maintained for at least three years, we can start working on a ZTK 2.0
> which introduces deprecation warnings about the changed behavior and a
> 3.0 that will change the default. If released at an interval of 18
> months like Python, that puts these changes about 3 years into the
> future with a lot of time in between to adjust.

We could also say that we will clean up the API when we move to Python 
3. That is a natural breaking point anyway, so it will not any extra 
pain for users of the ZCA.

Wichert.