On 4/13/07, Nick Alexander <[EMAIL PROTECTED]> wrote: > Just a heads up: the Python folks debated immutable vs. mutable sets > at some length. A little google-fu might be in order to address the > issues they had with mutable sets and the language.
Good point. See the docs here: http://docs.python.org/lib/types-set.html In particular, we should probably use the frozenset type to implement immutable sets. That said, I totally disagree with carrying their design over to SAGE, i.e., having mutable and immutable versions be different types -- having mutability be a property is better. For matrices having separate types would lead to a maintenance and implementation nightmare, and the same probably goes for sets, since in SAGE there are many many different types of sets, and will likely be many many more. > > Nick > > > > -- William Stein Associate Professor of Mathematics University of Washington http://www.williamstein.org --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to [EMAIL PROTECTED] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://sage.scipy.org/sage/ and http://modular.math.washington.edu/sage/ -~----------~----~----~----~------~----~------~--~---
