On Sat, 17 Apr 2010 13:31:54 -0700 Chris Rebert <c...@rebertia.com> wrote:
> On Sat, Apr 17, 2010 at 12:40 PM, Martin Hvidberg > <mar...@hvidberg.net> wrote: > > I have this code, it builds up a data structure of nested lists, > > and filling data in them. My problem is that it seems that one of > > the lists SA[1] is not a list of unique instances but rather > > individual links to the same variable. In the example below I > > assign 'X' to what I intended to be the first Compounds Name. But > > rather the 'X' goes into all the Compounds Name. I thought that the > > [:] in SAdata.extend([CP[:]]) would ensure copies rather than links > > to. What is going wrong? > > someList[:] only copies 1-level deep. If you have a list of lists, > none of the inner lists will be copied; you'll get a new list of > references to the same lists instead. I think your code assumes [:] > copies lists recursively. Expanding on that, Martin, I think "from copy import deepcopy" should solve that problem. /W -- INVALID? DE! -- http://mail.python.org/mailman/listinfo/python-list
