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--On Sunday, February 02, 2003 10:56:29 +1300 Andrew McGregor=20
<andrew@indranet.co.nz> wrote:
> Then:
>
> defmacro property(name, docstring, @get, @set, @delete):
> def getter interpolate(get.arglist):
> interpolate(get.block)
> def setter interpolate(set.arglist):
> interpolate(set.block)
> def deleter interpolate(delete.arglist):
> interpolate(delete.block)
> return:
> name =3D property(docstring, getter, setter, deleter)
>
> class Circle(object):
> property circumference, """Circumference of the circle""":
> get (self):
> return self.radius*6.283
> set (self, value):
> self.radius =3D value/6.283
> delete (self):
> del self.radius
>
> would do the obvious thing using block keyword arguments (I can't think
> how to express the anonymous scope implied here in regular Python; the
> intention is that getter and friends are defined in the local namespace
> of the macro invocation).
>
> Of course the proposed syntax is hypothetical, but I think it's quite
> clean.
Hmmm, maybe that should have been:
defmacro property(name, docstring, @block):
block()
return:
name =3D property(docstring, get, set, delete)
class Circle(object):
property(circumference, """Circumference of the circle"""):
def get(self):
return self.radius*6.283
def set(self, value):
self.radius =3D value/6.283
def delete(self):
del self.radius
I still think block keyword arguments would be nice, but this can be done=20
without them.
Andrew
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