Nathann Cohen wrote: > Hello !!! > > I always have to include in my graphs functions some part of code to > deal with the fact that for undirected graphs edges can be returned as > (u,v) or as (v,u), which my code does not like.... Isn't there a Sage a > type of variable which is both immutable and not ordered ? > > I'd love to have something like Set(u,v) but I also need it to be > immutable, hashable, etc... ;-) >
frozenset would be the python answer to your question. I'm not sure if Sage has a better answer: http://docs.python.org/library/stdtypes.html#set-types-set-frozenset Jason -- Jason Grout --~--~---------~--~----~------------~-------~--~----~ To post to this group, send an email to [email protected] To unsubscribe from this group, send an email to [email protected] For more options, visit this group at http://groups.google.com/group/sage-devel URL: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
