copy.deepcopy apparently preserves multiple references to the same object:
$ python
Python 2.5.2 (r252:60911, Jan 4 2009, 17:40:26)
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import copy
>>> d = [1,2,3]
>>> r = copy
Thanks everyone! The list-comprehension approach should work in my case
as I know a priori that my data structure is finite. Still, it'd be
awfully convenient for Python's copy module to offer a copy.deepercopy
function -- even if it comes with the caveat that it will explode if
given a data stru
