[Python-Dev] Running Py2.6 with the -3 option

[Terry Reedy]

Benjamin Peterson wrote:
> On Tue, Jul 15, 2008 at 12:37 PM, Guido van Rossum <guido at python.org> wrote:
>> I wonder if it might not be simpler (at least in some cases) to just
>> disable the warnings for certain modules? I imagine in many cases
>> fixing up the 2.6 code to suppress -3 warnings would be mere busywork
>> -- e.g. for code that gets deleted in 3.0 altogether. (Hm, in fact for
>> such code there's no need to suppress the -3 warnings, as they serve
>> as a warning to any user of the module that they are using something
>> that won't survive into 3.0.)
> 
> Very true. It might be easiest to just throw (maybe even just temporarily)
> 
> if sys.py3kwarning:
>     warnings.filterwarnings("ignore", category=DeprecationWarning,
> module=__name__)
> 
> at the top of the offending module.

Is it possible to *first* 'raise' a DeprecationWarning("This module will 
disappear") before turning the rest off?  Exactly 1 seems the right 
number to me for modules that will go.