What is the situation with sorting of graph vertices in Python 3?
Currently one can not, for example, create a poset with Py3. This comes down to 42 < 'xyz', which raises exception in Py3, but returns either True or False in Py2. Comparison is used in sorted(), which is used in .vertices() for (di)graphs.
It is trivial to try sort vertices, and when failed, return them in an arbitrary order, but I don't know what would be broken then.
-- Jori Mäntysalo
