self-aware list of objects able to sense constituent member alterations?

[koranthala]

On Jan 28, 5:42 pm, koranthala <koranth... at gmail.com> wrote:
> On Jan 28, 2:16 am, Reckoner <recko... at gmail.com> wrote:
>
>
>
> > I'm not sure this is possible, but I would like to have
> > a list of  objects
>
> > A=[a,b,c,d,...,z]
>
> > where,  in the midst of a lot of processing I might do something like,
>
> > A[0].do_something_which_changes_the_properties()
>
> > which alter the properties of the object 'a'.
>
> > The trick is that I would like A to be mysteriously aware that
> > something about the  object 'a' has changed so that when I revisit A,
> > I will know that the other items in the list need to be refreshed to
> > reflect the changes in A as a result of changing 'a'.
>
> > Even better would be to automatically percolate the subsequent changes
> > that resulted from altering 'a' for the rest of the items in the list.
> > Naturally, all of these items are related in some parent-child
> > fashion.
>
> > that might be a lot to ask, however.
>
> > Any advice appreciated.
>
> I think Python Cookbook has a recipe which deals with this.
> - 6.12 Checking an Instance for Any State Change.

Were you able to get this? If not, let me know. I will try to type it
in here - (it is a big recipe, so not doing it now)