[Python-Dev] PEP 218 (sets); moving set.py to Lib

[Guido van Rossum]

By the way, I've checked in the "sets" module in Lib.  The unit tests
in test/test_sets.py need work (no tests for ImmutableSet for example)
and there's no latex documentation; however "import sets; help(sets)"
shows a wealth of information derived from docstrings.  I plan to fix
the unit tests but could use help with the docs.

--Guido van Rossum (home page: http://www.python.org/~guido/)