> Why not have the property find its name in the class's __dict__,
> something like this:
>
> (in class property)
> def __set__(self, obj, value):
> if self.fset is not None:
> self.fset(obj, value)
> else:
> for key, value in type(obj).__dict__.iteritems():
> if value is self:
> raise AttributeError, "Property '" + key + "' is read-only."
> # No name? Strange put possible I guess.
> raise AttributeError, "can't set property"
You'd have to search base classes too, in MRO order. Doable, but
makes AttributeError very expensive. (This can be a concern if it is
in fact being caught.)
It could also be misleading -- the same property object may occur more
than once, and you don't know which one was being set.
I think it's best to rely on the traceback. If the traceback looks
like
Traceback (most recent call last):
File "foo.py", line 42, in bar
self.foo = 42
AttributeError: can't set attribute
the problem should be clear enough.
--Guido van Rossum (home page: http://www.python.org/~guido/)
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