En Wed, 22 Jul 2009 05:31:13 -0300, Jon Clements <jon...@googlemail.com>
escribió:
On 22 July, 06:02, "Gabriel Genellina" <gagsl-...@yahoo.com.ar> wrote:
I have a class attribute 'foo' which is a data descriptor. I create an
instance of such class. When I say instance.foo = value, the descriptor
__set__ method is called. Is there any way to obtain the name being
assigned to? ('foo' in this example). That is, I want to know the
target
name for the assignment that triggered the __set__ method call.
class Test:
def __setattr__(self, what, value):
print what, value
t = Test()
t.foo = 'x'
foo x
Is that what you're after?
Yes and no. __setattr__ has a terrible overhead as it is invoked for each
and every attribute being set, special or not. Using a custom descriptor
seems better, because it allows to intercept just the desired attribute.
If only I had access to the name being used...
--
Gabriel Genellina
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