[Python-Dev] Declaring setters with getters
Guido van Rossum
guido at python.org
Thu Nov 1 18:35:31 CET 2007
On 11/1/07, glyph at divmod.com <glyph at divmod.com> wrote:
> This is a minor nit, as with all decorators that take an argument, it
> seems like it sets up a hard-to-debug error condition if you were to
> accidentally forget it:
>
> @property
> def foo(): ...
> @property.set
> def foo(): ...
>
> would leave you with 'foo' pointing at something that wasn't a
> descriptor at all. Is there a way to make that more debuggable?
Yes, if you remember my initial post, it contained this line:
assert isinstance(prop, property)
And even without that, accessing prop.fget would fail immediately; so
instead of a non-functioning property, you get an exception at class
definition time.
--
--Guido van Rossum (home page: http://www.python.org/~guido/)
More information about the Python-Dev
mailing list