menesis at pov
May 21, 2012, 1:49 AM
Post #8 of 13
2012/5/20 Tres Seaver <tseaver [at] palladion>:
Re: zope.interface 4.0.0 considered annoying.
[In reply to]
> On 05/19/2012 07:23 PM, Jim Fulton wrote:
>> On Sat, May 19, 2012 at 5:59 PM, Tres Seaver <tseaver [at] palladion>
>>> On 05/19/2012 12:12 PM, Jim Fulton wrote:
>>>> The declaration-syntax warnings in the zope.interface 4.0.0 are
>>>> annoying and mostly pointless.
>>>> There will be enough pain in porting applications to Python 3,
>>>> avoiding the surprise of having to use a different
>>>> interface-declaration syntax will not be of any consequence.
>>>> While the deprecation warning may provide some tiny benefit, the
>>>> annoyance, especially for applications or libraries that still
>>>> support Python 2.5 far outweights the benefit.
>>> We're in an odd spot: ¬†the Python3 support for zope.interface
>>> mostly works, but the class advice bits (implements,
>>> implementsOnly, classProvides) fail silently under Python3 before
>>> 4.0.0: ¬†they literally have no effect due to changes in class
>>> initialization machinery. zope.interface 4.0.0 changes those silent
>>> failures into exceptions (which is what I thought you were going to
>>> complain about).
>> I'd forgotten the fail silently bit. ¬†Can't we make the fail loudly
>> for Python 3?
> They already do: ¬†4.0.0 makes them exceptions under Python3: ¬†that fact
> was actually my rationale for the warnings under Python2, to allow folks
> to find and remediate them before porting.
If they are exceptions under Python 3, developers will get them and
have to fix when porting to Python 3. There is a lot of other work to
be done at the same time. But under Python 2, implements and friends
continue to work, so the warnings are very annoying.
> I will release a 4.0.1 silencing the warnings unless somebody speaks up
> in their favor.
Please, only warn on Python 3.
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