Access to static members from inside a method decorator?

Bruno Desthuilliers onurb at xiludom.gro
Thu Oct 5 19:31:02 CEST 2006


glen.coates.bigworld at gmail.com wrote:
> Bruno Desthuilliers wrote:
(snip)
>> class Exposing(object):
>>   @classmethod
>>   def get_exposed_methods(cls):
>>     try:
>>       exposeds = cls._exposed_methods
>>     except AttributeError:
>>       exposeds = []
>>       for name in dir(cls):
>>         obj = getattr(cls, name)
>>         if exposed(obj):
>>           exposeds.append(obj)
>>       cls._exposed_methods = exposeds
>>     return exposeds
>>
>> class Parrot(Exposing):
>>   @expose
>>   def parrot(self, what):
>>     return "%s says %s" % (self, str(what))
> 
> Thanks Bruno.  I came up with a similar solution today at work, which
> involves an 'init' method which is called at the bottom of each module
> that defines subclasses of Exposed and sets up static mappings for the
> exposed methods.  I guess my solution is slightly less elegant because
> it requires this ugly explicit init call outside the classes that it
> actually deals with, 

This is only a problem in a framework-style use.

> however it is more efficient because the dir()
> pass happens once on module load, instead of every time I want the list
> of exposed methods.

I think you have missed a point in my solution : the 'collect' pass
happens only once for each class - the first time the
get_exposed_methods is called on the class (or any instance of). It's
then memoized for latter calls.

-- 
bruno desthuilliers
python -c "print '@'.join(['.'.join([w[::-1] for w in p.split('.')]) for
p in 'onurb at xiludom.gro'.split('@')])"



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