On 2 Aug, 10:39, Michael Brickenstein <brickenst...@mfo.de> wrote: > str is very much immutable. > So you can't even set some custom attribute. > For that you have to sublass. Look what happens, when you subclass str > and get some mutable class > this way: > > In [10]: class A(str): > ....: pass > > In [11]: a=A() > > In [13]: copy(a) is a > Out[13]: False > > while copy is the identity on str.
Hi Michael, Thank you for the detailed information. I think since strings unlike polynomials are properly immutable, the decision to have copy return the same instance can't simply be carried over to polynomials. Personally, I think that "copy" should just return an independent copy. Sebastian -- To post to this group, send an email to sage-devel@googlegroups.com To unsubscribe from this group, send an email to sage-devel+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org
