Using 'apply' as a decorator, to define constants

[Jonathan Fine]

Jonathan Gardner wrote:
> On Aug 21, 9:09 am, alex23 <wuwe... at gmail.com> wrote:
>> On Aug 21, 11:36 pm, Jonathan Fine <jf... at pytex.org> wrote:
>>
>> class ColourThing(object):
>>     @apply
>>     def rgb():
>>         def fset(self, rgb):
>>             self.r, self.g, self.b = rgb
>>         def fget(self):
>>             return (self.r, self.g, self.b)
>>         return property(**locals())
>>
> 
> This is brilliant. I am going to use this more often. I've all but
> given up on property() since defining "get_foo", "get_bar", etc... has
> been a pain and polluted the namespace.


I think we can do better, with a little work.  And also solve the 
problem that 'apply' is no longer a builtin in Python3.

Here's my suggestion:
===
import wibble # Informs reader we're doing something special here.

class ColourThing(object):

     @wibble.property
     def rgb():
         '''This is the docstring for the property.'''
         def fset(self, rgb):
             self.r, self.g, self.b = rgb
         def fget(self):
             return (self.r, self.g, self.b)
         return locals()
===

And here's wibble.property()
===
_property = property  # Avoid collision.
def property(fn):
     return _property(doc=fn.__doc__, **fn())
===

We can add apply() to the wibble module.  By the way, 'wibble' is a 
placeholder to the real name.  Any suggestions?

-- 
Jonathan