[Python-Dev] Re: Extended Function syntax

[Gerald S. Williams]

Just van Rossum wrote:
> With MWH's patch, this could be:
> 
> class Foo(object):
>      class myprop [property]:
>          """A computed property on Foo objects."""
> 
>          def __get__(self):
>              return ...
>          def __set__(self):
>              ...
>          def __delete__(self):
>              ...

That doesn't feel right to me. You generally want
self to refer to the Foo object, don't you? With
the class notation, I'd expect self to refer to
Foo.myprop objects. I know they're properties of
the Foo object, but somehow it still seems like a
stretch.

Manual Garcia's recommendation seems cleaner:

>     j = block:
>         def _get_j(self): return self._j
>         def _set_j(self, j): self._j = j
>         return property(_get_j, _set_j, None, 'dynamite!')

Although the following idiom works fine for me:

class Parrot(object):
    def count():
        "Treat mostly-parrots as full parrots."
        def Get(self): return self._count
        def Set(self,count): self._count = int(round(count))
        def Del(self): self._count = 0
        return property(Get,Set,Del,"Current parrot count")
    count = count()

-Jerry