[Python-Dev] Declaring setters with getters (original) (raw)

Guido van Rossum guido at python.org
Sat Nov 10 22:17:39 CET 2007

On Nov 10, 2007 11:09 AM, Steven Bethard <steven.bethard at gmail.com> wrote:

On Nov 10, 2007 11:31 AM, Guido van Rossum <guido at python.org> wrote: > Unless I get negative feedback really soon I plan to submit this later > today. I've tweaked the patch slightly to be smarter about replacing > the setter and the deleter together if they are the same object.

Definitely +1 on the basic patch. Could you explain briefly the advantage of the "hack" that merges the set and del methods? Looking at the patch, I get a little nervous about this:: @foo.setter def foo(self, value=None): if value is None: del self.foo else: self.foo = abs(value) That means that c.foo = None is equivalent to del c.foo right?

Which is sometimes convenient. But thinking about this some more I think that if I wanted to use the same method as setter and deleter, I could just write

@foo.setter @foo.deleter def foo(self, value=None): ...

So I'm withdrawing the hacks, making the code and semantics much simpler.

See propset3.diff in http://bugs.python.org/issue1416 .

-- --Guido van Rossum (home page: http://www.python.org/~guido/)

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