obj in list and list ids the same

[rdudfield at my-deja.com]

In article <84btoo$mem$1 at nntp.Stanford.EDU>,
  amitp at Xenon.Stanford.EDU (Amit Patel) wrote:
>   <rdudfield at my-deja.com> wrote:
> | Hello,
> |
> | I've got a problem where a list has the same id as a object instance in that
> | same list.  This is as returned by id().
> |
> | Is this ever supposed to happen?  I just thought this was odd.
>
> It is odd.
>
> Here's how it could happen:
>
> >>> a = []
> >>> a.append(a)
>
> >>> id(a)
> 135070976
>
> >>> id(a[0])
> 135070976
>
> Let's try printing this:
>
> >>> a
> [[...]]
>
> The list has a pointer to itself.  I'm not sure if this is the same
> problem you're seeing, but you might poke around to see if you're
> accidentally using some list instead of some list[some index].
>

Looks like I was doing something wrong for the id.  After a nights sleep I
found it in the morning.  Thanks for the help Laurence and Amit :)

It seems that deepcopy doesn't work for what I am doing.  That is tempNode =
copy.deepcopy(self)  because tempNode.value[0].listOfShapes and
self.value[0].listOfShapes have the same id.  I guess this is reasonable.  So
I just manually copy the list with a new one, not too hard now that I know :)


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