Revised PEP 318 - Function/Method Decorator Syntax

[Andrew Bennetts]

On Wed, Jun 11, 2003 at 11:39:18AM +1000, Andrew Bennetts wrote:
> On Tue, Jun 10, 2003 at 02:28:45PM -0000, Moshe Zadka wrote:
> > 
> > Wouldn't it be more readable (:)) if you did
> > 
> > class _EvilProperty(type):
> >     ....
> > class EvilProperty:
> >     __metaclass__ = _EvilProperty
> > 
> > class C(object):
> >     class x(EvilProperty):
> >         def get(self):
> [...etc...]
> 
> No, it wouldn't be more readable, because it wouldn't work...

But this would:

----
class _EvilProperty(type):
    def __new__(cls, name, bases, d):
        if d.get('__metaclass__') == _EvilProperty:
            return type.__new__(cls, name, bases, d)
        else:
            return property(d.get('get'), d.get('set'), d.get('del'),
                            d.get('__doc__'))

class EvilProperty:
    __metaclass__ = _EvilProperty

class C(object):
    class x(EvilProperty):
        """An evil test property"""
        def get(self):
            print 'Getting'
            return 1
        def set(self, value):
            print 'Setting to', value
            
c = C()
print c.x
c.x = 5  
print C.x.__doc__
----

:)

Ta-da!  Easy, clean-looking properties, no new syntax required ;)

-Andrew.