On Thu, 23 Aug 2012 20:36:27 -0400, Roy Smith wrote: > The id has changed! Now, we all know that the id of an object is its > memory address (that's not guaranteed, but in the standard C > implementation of Python, that's what it is).
It's not only "not guaranteed", it is *explicitly* noted as an implementation detail. The id of the object is an arbitrary number guaranteed to be unique during the lifetime of that object. It just happens that CPython currently uses the memory address as the id. Jython does not: steve@runes:~$ jython Jython 2.5.1+ (Release_2_5_1, Aug 4 2010, 07:18:19) [OpenJDK Client VM (Sun Microsystems Inc.)] on java1.6.0_18 Type "help", "copyright", "credits" or "license" for more information. >>> x = 42 >>> id(x) 1 Nor does IronPython: steve@runes:~$ ipy IronPython 2.6 Beta 2 DEBUG (2.6.0.20) on .NET 2.0.50727.1433 Type "help", "copyright", "credits" or "license" for more information. >>> x = 42 >>> id(x) 43 -- Steven -- http://mail.python.org/mailman/listinfo/python-list
