Deprecate the sets module.

Doc/lib/libsets.tex

@@ -9,6 +9,8 @@
 \sectionauthor{Raymond D. Hettinger}{python@rcn.com}
 
 \versionadded{2.3}
+\deprecated{2.6}{ The built-in \code{set}/\code{frozneset} types replace this
+module.}
 
 The \module{sets} module provides classes for constructing and manipulating
 unordered collections of unique elements.  Common uses include membership

Lib/sets.py

@@ -80,6 +80,10 @@ except ImportError:
 
 __all__ = ['BaseSet', 'Set', 'ImmutableSet']
 
+import warnings
+warnings.warn("the sets module is deprecated", DeprecationWarning,
+                stacklevel=2)
+
 class BaseSet(object):
     """Common base class for mutable and immutable sets."""
 

Lib/test/test___all__.py

@@ -9,6 +9,8 @@ warnings.filterwarnings("ignore",
                         "the gopherlib module is deprecated",
                         DeprecationWarning,
                         "<string>")
+warnings.filterwarnings("ignore", "the sets module is deprecated",
+                        DeprecationWarning, "<string>")
 
 class AllTest(unittest.TestCase):
 

Lib/test/test_sets.py

@@ -1,5 +1,9 @@
 #!/usr/bin/env python
 
+import warnings
+warnings.filterwarnings("ignore", "the sets module is deprecated",
+                        DeprecationWarning, "test\.test_sets")
+
 import unittest, operator, copy, pickle, random
 from sets import Set, ImmutableSet
 from test import test_support

Misc/NEWS

@@ -109,6 +109,9 @@ Core and builtins
 Library
 -------
 
+- The sets module has been deprecated.  Use the built-in set/frozenset types
+  instead.
+
 - Bug #1610795: make ctypes.util.find_library work on BSD systems.
 
 - Fixes for 64-bit Windows: In ctypes.wintypes, correct the