Steven D'Aprano wrote:
On Sat, 22 Aug 2009 10:51:27 +0100, Jonathan Fine wrote:
Steven D'Aprano wrote:
There's a standard idiom for that, using the property() built-in, for
Python 2.6 or better.
Here's an example including a getter, setter, deleter and doc string,
with no namespace pollution, imports, or helper functions or deprecated
built-ins:
class ColourThing(object):
@property
def rgb(self):
"""Get and set the (red, green, blue) colours.""" return
(self.r, self.g, self.b)
@rgb.setter
def rgb(self, rgb):
self.r, self.g, self.b = rgb
@rgb.deleter
def rgb(self):
del self.r, self.g, self.b
Sorry, Steve, but I don't understand this. In fact, I don't even see
how it can be made to work.
Nevertheless, it does work, and it's not even magic. It's described (very
briefly) in the docstring for property: help(property) will show it to
you. More detail is here:
http://docs.python.org/library/functions.html#property
My apologies. I wasn't up to date with my Python versions:
| Changed in version 2.6: The getter, setter, and deleter
| attributes were added.
I was still thinking Python2.5 (or perhaps earlier?). I still don't
like it. All those repetitions of 'rgb'.
--
Jonathan
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