grocery_stocker wrote:
Given the following....
[cdal...@localhost ~]$ python
Python 2.4.3 (#1, Oct 1 2006, 18:00:19)
[GCC 4.1.1 20060928 (Red Hat 4.1.1-28)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
list = [7,8,9]
id(list)
-1209401076
id(list[0])
154303848
id(list[1])
154303836
id(list[2])
154303824
for x in list:
... print id(x),
...
154303848 154303836 154303824
id(7)
154303848
id(8)
154303836
id(9)
154303824
It seems like id(list[<some value>]) == id(<some value>). However, I
can't find anything in the python documentation that talks about it.
Did I perhaps overlook something?
No you didn't overlook anything. Here's the (full and complete)
documentation for id. Anything else you may notice about the values
of id() are implementation details, and must not be depended upon.
You may, however, be able to use what you've noticed to discern some
things about the inner workings of Python, in particular how it stores
multiple instances of immutable objects. But be warned Python makes
some fairly complex decisions here in the interest of efficiency.
*id*( object)
Return the ``identity'' of an object. This is an integer (or long
integer) which is guaranteed to be unique and constant for this
object during its lifetime. Two objects with non-overlapping
lifetimes may have the same id() value. (Implementation note: this
is the address of the object.)
Gary Herron
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