More user feedback on Sets.py

[Raymond Hettinger]

For Py2.4, I'm working on a C implementation of Sets.py with the possibility of
having a set() type as a builtin.  There is a question as whether the current
design for set of sets has been useful.

To support sets-of-sets, the current design includes an automatic conversion to
an immutable set class.  The original use case was for implementing graph
algorithms.

Has anyone used sets-of-sets to solve any non-toy problems?
Has anyone successfully applied sets-of-sets to graph algorithms?
If the need has arisen, is the current design sufficient?


Raymond Hettinger