David Moss wrote:
Hi,
I want to manage and control access to several important attributes in
a class and override the behaviour of some of them in various
subclasses.
Below is a stripped version of how I've implemented this in my current
bit of work.
It works well enough, but I can't help feeling there a cleaner more
readable way of doing this (with less duplication, etc).
Is this as good as it gets or can this be refined and improved
especially if I was to add in a couple more attributes some fairly
complex over-ride logic?
The extended property type in Python 2.6 makes it much easier to
overwrite the getter, sett or deleter of a property:
http://docs.python.org/dev/library/functions.html?highlight=property#property
class C(object):
def __init__(self): self._x = None
@property
def x(self):
"""I'm the 'x' property."""
return self._x
@x.setter
def x(self, value):
self._x = value
@x.deleter
def x(self):
del self._x
class D(C):
@C.x.getter
def x(self):
return 2 * self._x
@x.setter
def x(self, value):
self._x = value // 2
Christian
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