On 25/10/11 00:02, Christopher King wrote:
Dear Tutors,
I am trying to make an object, which will appear exactly like an
object of my choice. It will should be impossible to tell it is not the
object.
We can get pretty close but I suspect its impossible to make it 100%
reliable - otherwise Python itself would get confused!
> This is because I am making an object that modifies it methods
so that if the methods make a change to the object, it will sync those
changes to a file, but I don't want it to be another object,
so foreign functions will not mistake for not being the object.
Sorry that bit lost me!
You want to persist data changes to a file? Thats easy enough.
But the last two lines sem disconnected fro the saving to file bit?
> For example if, I used type on the object, it should return
> the class of the object it is trying to mimic.
And presumably isinstance() too?
but I had no luck. In a nutshell, I want an object that walks like
another object, quacks like another object, and basically is another
object.
But basically is NOT another object I think you mean.
If you really want it to be the other object then just make another
instance cloning the attributes. But I don;t think thats really what you
want?
Is this possible?
If you are prepared to spend a lot of time implementing all the meta
methods etc then you should be able to get pretty close. But it
will be tedious. I suspect there will almost certainly be a better
solution if we understood the actual problem you are trying to solve.
(The facade design pattern sounds likely for example!)
HTH,
--
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
_______________________________________________
Tutor maillist - Tutor@python.org
To unsubscribe or change subscription options:
http://mail.python.org/mailman/listinfo/tutor
