On Nov 1, 2007, at 9:18 PM, Fred Drake wrote:
Thanks! Of all the proposals that have been presented, I still like
that the best.
I've attached a quick hack of an implementation, just to play with it
and see how it feels. Here's an example use:
from property import property
class Base(object):
@property
def attribute(self):
print("Base.attribute (getter)")
return 42
@property.get(attribute)
def rwattribute(self):
print("Base.rwattribute (getter)")
return self.attribute * 2
@property.set(rwattribute)
def rwattribute(self, value):
print("Base.rwattribute (setter)")
self.saved = value
class Derived(Base):
@property.get(Base.attribute)
def roattribute(self):
print("Derived.roattribute (getter)")
return self.attribute / 2
-Fred
--
Fred Drake <fdrake at acm.org>
import __builtin__
class property(__builtin__.property):
__slots__ = ()
@classmethod
def get(cls, base):
return PropertyCombiner(cls, base).get
@classmethod
def set(cls, base):
return PropertyCombiner(cls, base).set
@classmethod
def delete(cls, base):
return PropertyCombiner(cls, base).delete
class PropertyCombiner(object):
__slots__ = "cls", "base"
def __init__(self, cls, base):
assert isinstance(base, __builtin__.property)
assert issubclass(cls, property)
self.cls = cls
self.base = base
def get(self, fget):
return self.cls(fget, self.base.fset, self.base.fdel)
def set(self, fset):
return self.cls(self.base.fget, fset, self.base.fdel)
def delete(self, fdel):
return self.cls(self.base.fget, self.base.fset, fdel)
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