3 files changed, 0 insertions, 855 deletions
diff --git a/Lib/test/test_cookielib.py b/Lib/test/test_cookielib.py
index 991506c..544f29f 100644
--- a/Lib/test/test_cookielib.py
+++ b/Lib/test/test_cookielib.py
@@ -1723,7 +1723,6 @@ class LWPCookieTests(TestCase):
 
 
 def test_main(verbose=None):
-    from test import test_sets
     test_support.run_unittest(
         DateTimeTests,
         HeaderTests,
diff --git a/Lib/test/test_set.py b/Lib/test/test_set.py
index 6641ff8..9bd0d43 100644
--- a/Lib/test/test_set.py
+++ b/Lib/test/test_set.py
@@ -1451,7 +1451,6 @@ class TestVariousIteratorArgs(unittest.TestCase):
 #==============================================================================
 
 def test_main(verbose=None):
-    from test import test_sets
     test_classes = (
         TestSet,
         TestSetSubclass,
diff --git a/Lib/test/test_sets.py b/Lib/test/test_sets.py
deleted file mode 100644
index 88cfcac..0000000
--- a/Lib/test/test_sets.py
+++ /dev/null
@@ -1,853 +0,0 @@
-#!/usr/bin/env python
-
-import unittest, operator, copy, pickle, random
-from sets import Set, ImmutableSet
-from test import test_support
-
-empty_set = Set()
-
-#==============================================================================
-
-class TestBasicOps(unittest.TestCase):
-
-    def test_repr(self):
-        if self.repr is not None:
-            self.assertEqual(repr(self.set), self.repr)
-
-    def test_length(self):
-        self.assertEqual(len(self.set), self.length)
-
-    def test_self_equality(self):
-        self.assertEqual(self.set, self.set)
-
-    def test_equivalent_equality(self):
-        self.assertEqual(self.set, self.dup)
-
-    def test_copy(self):
-        self.assertEqual(self.set.copy(), self.dup)
-
-    def test_self_union(self):
-        result = self.set | self.set
-        self.assertEqual(result, self.dup)
-
-    def test_empty_union(self):
-        result = self.set | empty_set
-        self.assertEqual(result, self.dup)
-
-    def test_union_empty(self):
-        result = empty_set | self.set
-        self.assertEqual(result, self.dup)
-
-    def test_self_intersection(self):
-        result = self.set & self.set
-        self.assertEqual(result, self.dup)
-
-    def test_empty_intersection(self):
-        result = self.set & empty_set
-        self.assertEqual(result, empty_set)
-
-    def test_intersection_empty(self):
-        result = empty_set & self.set
-        self.assertEqual(result, empty_set)
-
-    def test_self_symmetric_difference(self):
-        result = self.set ^ self.set
-        self.assertEqual(result, empty_set)
-
-    def checkempty_symmetric_difference(self):
-        result = self.set ^ empty_set
-        self.assertEqual(result, self.set)
-
-    def test_self_difference(self):
-        result = self.set - self.set
-        self.assertEqual(result, empty_set)
-
-    def test_empty_difference(self):
-        result = self.set - empty_set
-        self.assertEqual(result, self.dup)
-
-    def test_empty_difference_rev(self):
-        result = empty_set - self.set
-        self.assertEqual(result, empty_set)
-
-    def test_iteration(self):
-        for v in self.set:
-            self.assert_(v in self.values)
-
-    def test_pickling(self):
-        p = pickle.dumps(self.set)
-        copy = pickle.loads(p)
-        self.assertEqual(self.set, copy,
-                         "%s != %s" % (self.set, copy))
-
-#------------------------------------------------------------------------------
-
-class TestBasicOpsEmpty(TestBasicOps):
-    def setUp(self):
-        self.case   = "empty set"
-        self.values = []
-        self.set    = Set(self.values)
-        self.dup    = Set(self.values)
-        self.length = 0
-        self.repr   = "Set([])"
-
-#------------------------------------------------------------------------------
-
-class TestBasicOpsSingleton(TestBasicOps):
-    def setUp(self):
-        self.case   = "unit set (number)"
-        self.values = [3]
-        self.set    = Set(self.values)
-        self.dup    = Set(self.values)
-        self.length = 1
-        self.repr   = "Set([3])"
-
-    def test_in(self):
-        self.failUnless(3 in self.set)
-
-    def test_not_in(self):
-        self.failUnless(2 not in self.set)
-
-#------------------------------------------------------------------------------
-
-class TestBasicOpsTuple(TestBasicOps):
-    def setUp(self):
-        self.case   = "unit set (tuple)"
-        self.values = [(0, "zero")]
-        self.set    = Set(self.values)
-        self.dup    = Set(self.values)
-        self.length = 1
-        self.repr   = "Set([(0, 'zero')])"
-
-    def test_in(self):
-        self.failUnless((0, "zero") in self.set)
-
-    def test_not_in(self):
-        self.failUnless(9 not in self.set)
-
-#------------------------------------------------------------------------------
-
-class TestBasicOpsTriple(TestBasicOps):
-    def setUp(self):
-        self.case   = "triple set"
-        self.values = [0, "zero", operator.add]
-        self.set    = Set(self.values)
-        self.dup    = Set(self.values)
-        self.length = 3
-        self.repr   = None
-
-#==============================================================================
-
-def baditer():
-    raise TypeError
-    yield True
-
-def gooditer():
-    yield True
-
-class TestExceptionPropagation(unittest.TestCase):
-    """SF 628246:  Set constructor should not trap iterator TypeErrors"""
-
-    def test_instanceWithException(self):
-        self.assertRaises(TypeError, Set, baditer())
-
-    def test_instancesWithoutException(self):
-        # All of these iterables should load without exception.
-        Set([1,2,3])
-        Set((1,2,3))
-        Set({'one':1, 'two':2, 'three':3})
-        Set(xrange(3))
-        Set('abc')
-        Set(gooditer())
-
-#==============================================================================
-
-class TestSetOfSets(unittest.TestCase):
-    def test_constructor(self):
-        inner = Set([1])
-        outer = Set([inner])
-        element = outer.pop()
-        self.assertEqual(type(element), ImmutableSet)
-        outer.add(inner)        # Rebuild set of sets with .add method
-        outer.remove(inner)
-        self.assertEqual(outer, Set())   # Verify that remove worked
-        outer.discard(inner)    # Absence of KeyError indicates working fine
-
-#==============================================================================
-
-class TestBinaryOps(unittest.TestCase):
-    def setUp(self):
-        self.set = Set((2, 4, 6))
-
-    def test_eq(self):              # SF bug 643115
-        self.assertEqual(self.set, Set({2:1,4:3,6:5}))
-
-    def test_union_subset(self):
-        result = self.set | Set([2])
-        self.assertEqual(result, Set((2, 4, 6)))
-
-    def test_union_superset(self):
-        result = self.set | Set([2, 4, 6, 8])
-        self.assertEqual(result, Set([2, 4, 6, 8]))
-
-    def test_union_overlap(self):
-        result = self.set | Set([3, 4, 5])
-        self.assertEqual(result, Set([2, 3, 4, 5, 6]))
-
-    def test_union_non_overlap(self):
-        result = self.set | Set([8])
-        self.assertEqual(result, Set([2, 4, 6, 8]))
-
-    def test_intersection_subset(self):
-        result = self.set & Set((2, 4))
-        self.assertEqual(result, Set((2, 4)))
-
-    def test_intersection_superset(self):
-        result = self.set & Set([2, 4, 6, 8])
-        self.assertEqual(result, Set([2, 4, 6]))
-
-    def test_intersection_overlap(self):
-        result = self.set & Set([3, 4, 5])
-        self.assertEqual(result, Set([4]))
-
-    def test_intersection_non_overlap(self):
-        result = self.set & Set([8])
-        self.assertEqual(result, empty_set)
-
-    def test_sym_difference_subset(self):
-        result = self.set ^ Set((2, 4))
-        self.assertEqual(result, Set([6]))
-
-    def test_sym_difference_superset(self):
-        result = self.set ^ Set((2, 4, 6, 8))
-        self.assertEqual(result, Set([8]))
-
-    def test_sym_difference_overlap(self):
-        result = self.set ^ Set((3, 4, 5))
-        self.assertEqual(result, Set([2, 3, 5, 6]))
-
-    def test_sym_difference_non_overlap(self):
-        result = self.set ^ Set([8])
-        self.assertEqual(result, Set([2, 4, 6, 8]))
-
-    def test_cmp(self):
-        a, b = Set('a'), Set('b')
-        self.assertRaises(TypeError, cmp, a, b)
-
-        # In py3k, this works!
-        self.assertRaises(TypeError, cmp, a, a)
-
-        self.assertRaises(TypeError, cmp, a, 12)
-        self.assertRaises(TypeError, cmp, "abc", a)
-
-    def test_inplace_on_self(self):
-        t = self.set.copy()
-        t |= t
-        self.assertEqual(t, self.set)
-        t &= t
-        self.assertEqual(t, self.set)
-        t -= t
-        self.assertEqual(len(t), 0)
-        t = self.set.copy()
-        t ^= t
-        self.assertEqual(len(t), 0)
-
-
-#==============================================================================
-
-class TestUpdateOps(unittest.TestCase):
-    def setUp(self):
-        self.set = Set((2, 4, 6))
-
-    def test_union_subset(self):
-        self.set |= Set([2])
-        self.assertEqual(self.set, Set((2, 4, 6)))
-
-    def test_union_superset(self):
-        self.set |= Set([2, 4, 6, 8])
-        self.assertEqual(self.set, Set([2, 4, 6, 8]))
-
-    def test_union_overlap(self):
-        self.set |= Set([3, 4, 5])
-        self.assertEqual(self.set, Set([2, 3, 4, 5, 6]))
-
-    def test_union_non_overlap(self):
-        self.set |= Set([8])
-        self.assertEqual(self.set, Set([2, 4, 6, 8]))
-
-    def test_union_method_call(self):
-        self.set.union_update(Set([3, 4, 5]))
-        self.assertEqual(self.set, Set([2, 3, 4, 5, 6]))
-
-    def test_intersection_subset(self):
-        self.set &= Set((2, 4))
-        self.assertEqual(self.set, Set((2, 4)))
-
-    def test_intersection_superset(self):
-        self.set &= Set([2, 4, 6, 8])
-        self.assertEqual(self.set, Set([2, 4, 6]))
-
-    def test_intersection_overlap(self):
-        self.set &= Set([3, 4, 5])
-        self.assertEqual(self.set, Set([4]))
-
-    def test_intersection_non_overlap(self):
-        self.set &= Set([8])
-        self.assertEqual(self.set, empty_set)
-
-    def test_intersection_method_call(self):
-        self.set.intersection_update(Set([3, 4, 5]))
-        self.assertEqual(self.set, Set([4]))
-
-    def test_sym_difference_subset(self):
-        self.set ^= Set((2, 4))
-        self.assertEqual(self.set, Set([6]))
-
-    def test_sym_difference_superset(self):
-        self.set ^= Set((2, 4, 6, 8))
-        self.assertEqual(self.set, Set([8]))
-
-    def test_sym_difference_overlap(self):
-        self.set ^= Set((3, 4, 5))
-        self.assertEqual(self.set, Set([2, 3, 5, 6]))
-
-    def test_sym_difference_non_overlap(self):
-        self.set ^= Set([8])
-        self.assertEqual(self.set, Set([2, 4, 6, 8]))
-
-    def test_sym_difference_method_call(self):
-        self.set.symmetric_difference_update(Set([3, 4, 5]))
-        self.assertEqual(self.set, Set([2, 3, 5, 6]))
-
-    def test_difference_subset(self):
-        self.set -= Set((2, 4))
-        self.assertEqual(self.set, Set([6]))
-
-    def test_difference_superset(self):
-        self.set -= Set((2, 4, 6, 8))
-        self.assertEqual(self.set, Set([]))
-
-    def test_difference_overlap(self):
-        self.set -= Set((3, 4, 5))
-        self.assertEqual(self.set, Set([2, 6]))
-
-    def test_difference_non_overlap(self):
-        self.set -= Set([8])
-        self.assertEqual(self.set, Set([2, 4, 6]))
-
-    def test_difference_method_call(self):
-        self.set.difference_update(Set([3, 4, 5]))
-        self.assertEqual(self.set, Set([2, 6]))
-
-#==============================================================================
-
-class TestMutate(unittest.TestCase):
-    def setUp(self):
-        self.values = ["a", "b", "c"]
-        self.set = Set(self.values)
-
-    def test_add_present(self):
-        self.set.add("c")
-        self.assertEqual(self.set, Set("abc"))
-
-    def test_add_absent(self):
-        self.set.add("d")
-        self.assertEqual(self.set, Set("abcd"))
-
-    def test_add_until_full(self):
-        tmp = Set()
-        expected_len = 0
-        for v in self.values:
-            tmp.add(v)
-            expected_len += 1
-            self.assertEqual(len(tmp), expected_len)
-        self.assertEqual(tmp, self.set)
-
-    def test_remove_present(self):
-        self.set.remove("b")
-        self.assertEqual(self.set, Set("ac"))
-
-    def test_remove_absent(self):
-        try:
-            self.set.remove("d")
-            self.fail("Removing missing element should have raised LookupError")
-        except LookupError:
-            pass
-
-    def test_remove_until_empty(self):
-        expected_len = len(self.set)
-        for v in self.values:
-            self.set.remove(v)
-            expected_len -= 1
-            self.assertEqual(len(self.set), expected_len)
-
-    def test_discard_present(self):
-        self.set.discard("c")
-        self.assertEqual(self.set, Set("ab"))
-
-    def test_discard_absent(self):
-        self.set.discard("d")
-        self.assertEqual(self.set, Set("abc"))
-
-    def test_clear(self):
-        self.set.clear()
-        self.assertEqual(len(self.set), 0)
-
-    def test_pop(self):
-        popped = {}
-        while self.set:
-            popped[self.set.pop()] = None
-        self.assertEqual(len(popped), len(self.values))
-        for v in self.values:
-            self.failUnless(v in popped)
-
-    def test_update_empty_tuple(self):
-        self.set.union_update(())
-        self.assertEqual(self.set, Set(self.values))
-
-    def test_update_unit_tuple_overlap(self):
-        self.set.union_update(("a",))
-        self.assertEqual(self.set, Set(self.values))
-
-    def test_update_unit_tuple_non_overlap(self):
-        self.set.union_update(("a", "z"))
-        self.assertEqual(self.set, Set(self.values + ["z"]))
-
-#==============================================================================
-
-class TestSubsets(unittest.TestCase):
-
-    case2method = {"<=": "issubset",
-                   ">=": "issuperset",
-                  }
-
-    reverse = {"==": "==",
-               "!=": "!=",
-               "<":  ">",
-               ">":  "<",
-               "<=": ">=",
-               ">=": "<=",
-              }
-
-    def test_issubset(self):
-        x = self.left
-        y = self.right
-        for case in "!=", "==", "<", "<=", ">", ">=":
-            expected = case in self.cases
-            # Test the binary infix spelling.
-            result = eval("x" + case + "y", locals())
-            self.assertEqual(result, expected)
-            # Test the "friendly" method-name spelling, if one exists.
-            if case in TestSubsets.case2method:
-                method = getattr(x, TestSubsets.case2method[case])
-                result = method(y)
-                self.assertEqual(result, expected)
-
-            # Now do the same for the operands reversed.
-            rcase = TestSubsets.reverse[case]
-            result = eval("y" + rcase + "x", locals())
-            self.assertEqual(result, expected)
-            if rcase in TestSubsets.case2method:
-                method = getattr(y, TestSubsets.case2method[rcase])
-                result = method(x)
-                self.assertEqual(result, expected)
-#------------------------------------------------------------------------------
-
-class TestSubsetEqualEmpty(TestSubsets):
-    left  = Set()
-    right = Set()
-    name  = "both empty"
-    cases = "==", "<=", ">="
-
-#------------------------------------------------------------------------------
-
-class TestSubsetEqualNonEmpty(TestSubsets):
-    left  = Set([1, 2])
-    right = Set([1, 2])
-    name  = "equal pair"
-    cases = "==", "<=", ">="
-
-#------------------------------------------------------------------------------
-
-class TestSubsetEmptyNonEmpty(TestSubsets):
-    left  = Set()
-    right = Set([1, 2])
-    name  = "one empty, one non-empty"
-    cases = "!=", "<", "<="
-
-#------------------------------------------------------------------------------
-
-class TestSubsetPartial(TestSubsets):
-    left  = Set([1])
-    right = Set([1, 2])
-    name  = "one a non-empty proper subset of other"
-    cases = "!=", "<", "<="
-
-#------------------------------------------------------------------------------
-
-class TestSubsetNonOverlap(TestSubsets):
-    left  = Set([1])
-    right = Set([2])
-    name  = "neither empty, neither contains"
-    cases = "!="
-
-#==============================================================================
-
-class TestOnlySetsInBinaryOps(unittest.TestCase):
-
-    def test_eq_ne(self):
-        # Unlike the others, this is testing that == and != *are* allowed.
-        self.assertEqual(self.other == self.set, False)
-        self.assertEqual(self.set == self.other, False)
-        self.assertEqual(self.other != self.set, True)
-        self.assertEqual(self.set != self.other, True)
-
-    def test_ge_gt_le_lt(self):
-        self.assertRaises(TypeError, lambda: self.set < self.other)
-        self.assertRaises(TypeError, lambda: self.set <= self.other)
-        self.assertRaises(TypeError, lambda: self.set > self.other)
-        self.assertRaises(TypeError, lambda: self.set >= self.other)
-
-        self.assertRaises(TypeError, lambda: self.other < self.set)
-        self.assertRaises(TypeError, lambda: self.other <= self.set)
-        self.assertRaises(TypeError, lambda: self.other > self.set)
-        self.assertRaises(TypeError, lambda: self.other >= self.set)
-
-    def test_union_update_operator(self):
-        try:
-            self.set |= self.other
-        except TypeError:
-            pass
-        else:
-            self.fail("expected TypeError")
-
-    def test_union_update(self):
-        if self.otherIsIterable:
-            self.set.union_update(self.other)
-        else:
-            self.assertRaises(TypeError, self.set.union_update, self.other)
-
-    def test_union(self):
-        self.assertRaises(TypeError, lambda: self.set | self.other)
-        self.assertRaises(TypeError, lambda: self.other | self.set)
-        if self.otherIsIterable:
-            self.set.union(self.other)
-        else:
-            self.assertRaises(TypeError, self.set.union, self.other)
-
-    def test_intersection_update_operator(self):
-        try:
-            self.set &= self.other
-        except TypeError:
-            pass
-        else:
-            self.fail("expected TypeError")
-
-    def test_intersection_update(self):
-        if self.otherIsIterable:
-            self.set.intersection_update(self.other)
-        else:
-            self.assertRaises(TypeError,
-                              self.set.intersection_update,
-                              self.other)
-
-    def test_intersection(self):
-        self.assertRaises(TypeError, lambda: self.set & self.other)
-        self.assertRaises(TypeError, lambda: self.other & self.set)
-        if self.otherIsIterable:
-            self.set.intersection(self.other)
-        else:
-            self.assertRaises(TypeError, self.set.intersection, self.other)
-
-    def test_sym_difference_update_operator(self):
-        try:
-            self.set ^= self.other
-        except TypeError:
-            pass
-        else:
-            self.fail("expected TypeError")
-
-    def test_sym_difference_update(self):
-        if self.otherIsIterable:
-            self.set.symmetric_difference_update(self.other)
-        else:
-            self.assertRaises(TypeError,
-                              self.set.symmetric_difference_update,
-                              self.other)
-
-    def test_sym_difference(self):
-        self.assertRaises(TypeError, lambda: self.set ^ self.other)
-        self.assertRaises(TypeError, lambda: self.other ^ self.set)
-        if self.otherIsIterable:
-            self.set.symmetric_difference(self.other)
-        else:
-            self.assertRaises(TypeError, self.set.symmetric_difference, self.other)
-
-    def test_difference_update_operator(self):
-        try:
-            self.set -= self.other
-        except TypeError:
-            pass
-        else:
-            self.fail("expected TypeError")
-
-    def test_difference_update(self):
-        if self.otherIsIterable:
-            self.set.difference_update(self.other)
-        else:
-            self.assertRaises(TypeError,
-                              self.set.difference_update,
-                              self.other)
-
-    def test_difference(self):
-        self.assertRaises(TypeError, lambda: self.set - self.other)
-        self.assertRaises(TypeError, lambda: self.other - self.set)
-        if self.otherIsIterable:
-            self.set.difference(self.other)
-        else:
-            self.assertRaises(TypeError, self.set.difference, self.other)
-
-#------------------------------------------------------------------------------
-
-class TestOnlySetsNumeric(TestOnlySetsInBinaryOps):
-    def setUp(self):
-        self.set   = Set((1, 2, 3))
-        self.other = 19
-        self.otherIsIterable = False
-
-#------------------------------------------------------------------------------
-
-class TestOnlySetsDict(TestOnlySetsInBinaryOps):
-    def setUp(self):
-        self.set   = Set((1, 2, 3))
-        self.other = {1:2, 3:4}
-        self.otherIsIterable = True
-
-#------------------------------------------------------------------------------
-
-class TestOnlySetsOperator(TestOnlySetsInBinaryOps):
-    def setUp(self):
-        self.set   = Set((1, 2, 3))
-        self.other = operator.add
-        self.otherIsIterable = False
-
-#------------------------------------------------------------------------------
-
-class TestOnlySetsTuple(TestOnlySetsInBinaryOps):
-    def setUp(self):
-        self.set   = Set((1, 2, 3))
-        self.other = (2, 4, 6)
-        self.otherIsIterable = True
-
-#------------------------------------------------------------------------------
-
-class TestOnlySetsString(TestOnlySetsInBinaryOps):
-    def setUp(self):
-        self.set   = Set((1, 2, 3))
-        self.other = 'abc'
-        self.otherIsIterable = True
-
-#------------------------------------------------------------------------------
-
-class TestOnlySetsGenerator(TestOnlySetsInBinaryOps):
-    def setUp(self):
-        def gen():
-            for i in xrange(0, 10, 2):
-                yield i
-        self.set   = Set((1, 2, 3))
-        self.other = gen()
-        self.otherIsIterable = True
-
-#------------------------------------------------------------------------------
-
-class TestOnlySetsofSets(TestOnlySetsInBinaryOps):
-    def setUp(self):
-        self.set   = Set((1, 2, 3))
-        self.other = [Set('ab'), ImmutableSet('cd')]
-        self.otherIsIterable = True
-
-#==============================================================================
-
-class TestCopying(unittest.TestCase):
-
-    def test_copy(self):
-        dup = self.set.copy()
-        dup_list = sorted(dup, key=repr)
-        set_list = sorted(self.set, key=repr)
-        self.assertEqual(len(dup_list), len(set_list))
-        for i in range(len(dup_list)):
-            self.failUnless(dup_list[i] is set_list[i])
-
-    def test_deep_copy(self):
-        dup = copy.deepcopy(self.set)
-        ##print type(dup), repr(dup)
-        dup_list = sorted(dup, key=repr)
-        set_list = sorted(self.set, key=repr)
-        self.assertEqual(len(dup_list), len(set_list))
-        for i in range(len(dup_list)):
-            self.assertEqual(dup_list[i], set_list[i])
-
-#------------------------------------------------------------------------------
-
-class TestCopyingEmpty(TestCopying):
-    def setUp(self):
-        self.set = Set()
-
-#------------------------------------------------------------------------------
-
-class TestCopyingSingleton(TestCopying):
-    def setUp(self):
-        self.set = Set(["hello"])
-
-#------------------------------------------------------------------------------
-
-class TestCopyingTriple(TestCopying):
-    def setUp(self):
-        self.set = Set(["zero", 0, None])
-
-#------------------------------------------------------------------------------
-
-class TestCopyingTuple(TestCopying):
-    def setUp(self):
-        self.set = Set([(1, 2)])
-
-#------------------------------------------------------------------------------
-
-class TestCopyingNested(TestCopying):
-    def setUp(self):
-        self.set = Set([((1, 2), (3, 4))])
-
-#==============================================================================
-
-class TestIdentities(unittest.TestCase):
-    def setUp(self):
-        self.a = Set([random.randrange(100) for i in xrange(50)])
-        self.b = Set([random.randrange(100) for i in xrange(50)])
-
-    def test_binopsVsSubsets(self):
-        a, b = self.a, self.b
-        self.assert_(a - b <= a)
-        self.assert_(b - a <= b)
-        self.assert_(a & b <= a)
-        self.assert_(a & b <= b)
-        self.assert_(a | b >= a)
-        self.assert_(a | b >= b)
-        self.assert_(a ^ b <= a | b)
-
-    def test_commutativity(self):
-        a, b = self.a, self.b
-        self.assertEqual(a&b, b&a)
-        self.assertEqual(a|b, b|a)
-        self.assertEqual(a^b, b^a)
-        if a != b:
-            self.assertNotEqual(a-b, b-a)
-
-    def test_reflexsive_relations(self):
-        a, zero = self.a, Set()
-        self.assertEqual(a ^ a, zero)
-        self.assertEqual(a - a, zero)
-        self.assertEqual(a | a, a)
-        self.assertEqual(a & a, a)
-        self.assert_(a <= a)
-        self.assert_(a >= a)
-        self.assert_(a == a)
-
-    def test_summations(self):
-        # check that sums of parts equal the whole
-        a, b = self.a, self.b
-        self.assertEqual((a-b)|(a&b)|(b-a), a|b)
-        self.assertEqual((a&b)|(a^b), a|b)
-        self.assertEqual(a|(b-a), a|b)
-        self.assertEqual((a-b)|b, a|b)
-        self.assertEqual((a-b)|(a&b), a)
-        self.assertEqual((b-a)|(a&b), b)
-        self.assertEqual((a-b)|(b-a), a^b)
-
-    def test_exclusion(self):
-        # check that inverse operations do not overlap
-        a, b, zero = self.a, self.b, Set()
-        self.assertEqual((a-b)&b, zero)
-        self.assertEqual((b-a)&a, zero)
-        self.assertEqual((a&b)&(a^b), zero)
-
-    def test_cardinality_relations(self):
-        a, b = self.a, self.b
-        self.assertEqual(len(a), len(a-b) + len(a&b))
-        self.assertEqual(len(b), len(b-a) + len(a&b))
-        self.assertEqual(len(a^b), len(a-b) + len(b-a))
-        self.assertEqual(len(a|b), len(a-b) + len(a&b) + len(b-a))
-        self.assertEqual(len(a^b) + len(a&b), len(a|b))
-
-#==============================================================================
-
-libreftest = """
-Example from the Library Reference:  Doc/lib/libsets.tex
-
->>> from sets import Set as Base  # override _repr to get sorted output
->>> class Set(Base):
-...     def _repr(self):
-...         return Base._repr(self, sorted=True)
->>> engineers = Set(['John', 'Jane', 'Jack', 'Janice'])
->>> programmers = Set(['Jack', 'Sam', 'Susan', 'Janice'])
->>> managers = Set(['Jane', 'Jack', 'Susan', 'Zack'])
->>> employees = engineers | programmers | managers           # union
->>> engineering_management = engineers & managers            # intersection
->>> fulltime_management = managers - engineers - programmers # difference
->>> engineers.add('Marvin')
->>> print engineers
-Set(['Jack', 'Jane', 'Janice', 'John', 'Marvin'])
->>> employees.issuperset(engineers)           # superset test
-False
->>> employees.union_update(engineers)         # update from another set
->>> employees.issuperset(engineers)
-True
->>> for group in [engineers, programmers, managers, employees]:
-...     group.discard('Susan')                # unconditionally remove element
-...     print group
-...
-Set(['Jack', 'Jane', 'Janice', 'John', 'Marvin'])
-Set(['Jack', 'Janice', 'Sam'])
-Set(['Jack', 'Jane', 'Zack'])
-Set(['Jack', 'Jane', 'Janice', 'John', 'Marvin', 'Sam', 'Zack'])
-"""
-
-#==============================================================================
-
-__test__ = {'libreftest' : libreftest}
-
-def test_main(verbose=None):
-    import doctest
-    from test import test_sets
-    test_support.run_unittest(
-        TestSetOfSets,
-        TestExceptionPropagation,
-        TestBasicOpsEmpty,
-        TestBasicOpsSingleton,
-        TestBasicOpsTuple,
-        TestBasicOpsTriple,
-        TestBinaryOps,
-        TestUpdateOps,
-        TestMutate,
-        TestSubsetEqualEmpty,
-        TestSubsetEqualNonEmpty,
-        TestSubsetEmptyNonEmpty,
-        TestSubsetPartial,
-        TestSubsetNonOverlap,
-        TestOnlySetsNumeric,
-        TestOnlySetsDict,
-        TestOnlySetsOperator,
-        TestOnlySetsTuple,
-        TestOnlySetsString,
-        TestOnlySetsGenerator,
-        TestOnlySetsofSets,
-        TestCopyingEmpty,
-        TestCopyingSingleton,
-        TestCopyingTriple,
-        TestCopyingTuple,
-        TestCopyingNested,
-        TestIdentities,
-        doctest.DocTestSuite(test_sets),
-    )
-
-if __name__ == "__main__":
-    test_main(verbose=True)