Accessing Objects Based On Their ID

[Fredrik Lundh]

Tim Daneliuk wrote:

> This is probably obvious to you Python Geniuses (tm) out there but,
> it is very late and I am experiencing Brain Fade:
>
> Given the ID of an object, is there a way to access it?

short answer: no.

longer answer: write a small C extension that casts an integer (or long integer)
argument to a PyObject, increments the refcount, and returns the object.  or
use gc.get_objects() to get a list of all GC-aware objects, and see if your object
is in there.  etc.  all solutions are fragile, non-portable, and/or inefficient.

> This comes up because of an implementation I had in mind wherein I
> would store the IDs of a notionally linked-list of objects - but without
> the link - I just want to store their IDs in the desired order.  But later,
> when I want to actually use the objects I need a way to get from ID back
> to something accessible in the namespace...

sounds like "import weakref" might be what you need.

</F>