On Sat, Nov 14, 2009 at 6:53 PM, Terry Reedy <tjre...@udel.edu> wrote: > Chris Rebert wrote: >> On Sat, Nov 14, 2009 at 3:25 PM, AON LAZIO <aonla...@gmail.com> wrote: >>> Hi, I have some problem with object reference >>> Say I have this code >>> >>> a = b = c = None >>> slist = [a,b,c] >> >> Values are stored in the list, not references to names. > > That is not right either, or else newbies would not be surprised by >>>> a = [0] >>>> b = [a] >>>> b[0][0] = 1 >>>> a > [1] > > Subscriptable collections associate subscripts with objects. > Namespaces associated names with objects. > In either case, if you change the object, you change it, regardless of how > you access it, such as by means of other associations. > If you replace an association by associating a name or subscript with a new > object, the old object is untouched (unless that was its last association) > and other access methods by means of other associations are not affected.
Okay, I should have technically said "references to objects" rather than "values", but in any case, names themselves are certainly not referenced or the following would print "[1]". >>> a = [0] >>> b = [a] >>> a = [42] >>> b[0][0] = 1 >>> a [42] Cheers, Chris -- http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
