> "Dave Brueck" <[EMAIL PROTECTED]> wrote in message > news:[EMAIL PROTECTED] > >>Michael wrote: >> >>>sorry, I'm used to working in c++ :-p >>> >>>if i do >>>a=2 >>>b=a >>>b=0 >>>then a is still 2!? >>> >>>so when do = mean a reference to the same object >> >>Always. >> >> >>>and when does it mean make a copy of the object?? >> >>Never. >>
Michael wrote: > except numbers?? > 1) Please avoid top posting 2) '=' always makes a reference. It's just that 'b = 0' makes a *new* reference for b to 0, without changing the reference of a to 2. b.pop() modifies the object referenced by b itself, which, since it is referenced by both a & b, means that the object referenced by a is also modified. see also: http://starship.python.net/crew/mwh/hacks/objectthink.html -- http://mail.python.org/mailman/listinfo/python-list
