Use == rather than cmp(). The return value of cmp() is not well defined when

comparing different types.

Lib/test/output/test_compare

 test_compare
-cmp(2, 2) = 0
-cmp(2, 2.2) = -1
-cmp(2, 2) = 0
-cmp(2, (2+4j)) = -1
-cmp(2, [1]) = -108
-cmp(2, (2,)) = -116
-cmp(2, None) = -78
-cmp(2, <Empty>) = -1
-cmp(2, <Coerce 3>) = -1
-cmp(2, <Cmp 4>) = -1
-cmp(2, <RCmp 5>) = -1
-cmp(2.2, 2) = 1
-cmp(2.2, 2.2) = 0
-cmp(2.2, 2) = 1
-cmp(2.2, (2+4j)) = 1
-cmp(2.2, [1]) = -108
-cmp(2.2, (2,)) = -116
-cmp(2.2, None) = -78
-cmp(2.2, <Empty>) = -1
-cmp(2.2, <Coerce 3>) = -1
-cmp(2.2, <Cmp 4>) = -1
-cmp(2.2, <RCmp 5>) = -1
-cmp(2, 2) = 0
-cmp(2, 2.2) = -1
-cmp(2, 2) = 0
-cmp(2, (2+4j)) = -1
-cmp(2, [1]) = -108
-cmp(2, (2,)) = -116
-cmp(2, None) = -78
-cmp(2, <Empty>) = -1
-cmp(2, <Coerce 3>) = -1
-cmp(2, <Cmp 4>) = -1
-cmp(2, <RCmp 5>) = -1
-cmp((2+4j), 2) = 1
-cmp((2+4j), 2.2) = -1
-cmp((2+4j), 2) = 1
-cmp((2+4j), (2+4j)) = 0
-cmp((2+4j), [1]) = -108
-cmp((2+4j), (2,)) = -116
-cmp((2+4j), None) = -78
-cmp((2+4j), <Empty>) = -1
-cmp((2+4j), <Coerce 3>) = -1
-cmp((2+4j), <Cmp 4>) = -1
-cmp((2+4j), <RCmp 5>) = -1
-cmp([1], 2) = 108
-cmp([1], 2.2) = 108
-cmp([1], 2) = 108
-cmp([1], (2+4j)) = 108
-cmp([1], [1]) = 0
-cmp([1], (2,)) = -8
-cmp([1], None) = 30
-cmp([1], <Empty>) = -1
-cmp([1], <Coerce 3>) = 1
-cmp([1], <Cmp 4>) = 1
-cmp([1], <RCmp 5>) = -1
-cmp((2,), 2) = 116
-cmp((2,), 2.2) = 116
-cmp((2,), 2) = 116
-cmp((2,), (2+4j)) = 116
-cmp((2,), [1]) = 8
-cmp((2,), (2,)) = 0
-cmp((2,), None) = 38
-cmp((2,), <Empty>) = -1
-cmp((2,), <Coerce 3>) = 1
-cmp((2,), <Cmp 4>) = 1
-cmp((2,), <RCmp 5>) = -1
-cmp(None, 2) = 78
-cmp(None, 2.2) = 78
-cmp(None, 2) = 78
-cmp(None, (2+4j)) = 78
-cmp(None, [1]) = -30
-cmp(None, (2,)) = -38
-cmp(None, None) = 0
-cmp(None, <Empty>) = -1
-cmp(None, <Coerce 3>) = 1
-cmp(None, <Cmp 4>) = 1
-cmp(None, <RCmp 5>) = -1
-cmp(<Empty>, 2) = 1
-cmp(<Empty>, 2.2) = 1
-cmp(<Empty>, 2) = 1
-cmp(<Empty>, (2+4j)) = 1
-cmp(<Empty>, [1]) = 1
-cmp(<Empty>, (2,)) = 1
-cmp(<Empty>, None) = 1
-cmp(<Empty>, <Empty>) = 0
-cmp(<Empty>, <Coerce 3>) = -1
-cmp(<Empty>, <Cmp 4>) = -1
-cmp(<Empty>, <RCmp 5>) = 1
-cmp(<Coerce 3>, 2) = 1
-cmp(<Coerce 3>, 2.2) = 1
-cmp(<Coerce 3>, 2) = 1
-cmp(<Coerce 3>, (2+4j)) = 1
-cmp(<Coerce 3>, [1]) = -1
-cmp(<Coerce 3>, (2,)) = -1
-cmp(<Coerce 3>, None) = -1
-cmp(<Coerce 3>, <Empty>) = 1
-cmp(<Coerce 3>, <Coerce 3>) = 0
-cmp(<Coerce 3>, <Cmp 4>) = -1
-cmp(<Coerce 3>, <RCmp 5>) = -1
-cmp(<Cmp 4>, 2) = 1
-cmp(<Cmp 4>, 2.2) = 1
-cmp(<Cmp 4>, 2) = 1
-cmp(<Cmp 4>, (2+4j)) = 1
-cmp(<Cmp 4>, [1]) = -1
-cmp(<Cmp 4>, (2,)) = -1
-cmp(<Cmp 4>, None) = -1
-cmp(<Cmp 4>, <Empty>) = -1
-cmp(<Cmp 4>, <Coerce 3>) = 1
-cmp(<Cmp 4>, <Cmp 4>) = 0
-cmp(<Cmp 4>, <RCmp 5>) = -1
-cmp(<RCmp 5>, 2) = 1
-cmp(<RCmp 5>, 2.2) = 1
-cmp(<RCmp 5>, 2) = 1
-cmp(<RCmp 5>, (2+4j)) = 1
-cmp(<RCmp 5>, [1]) = 1
-cmp(<RCmp 5>, (2,)) = 1
-cmp(<RCmp 5>, None) = 1
-cmp(<RCmp 5>, <Empty>) = 1
-cmp(<RCmp 5>, <Coerce 3>) = 1
-cmp(<RCmp 5>, <Cmp 4>) = 1
-cmp(<RCmp 5>, <RCmp 5>) = 0
+2 == 2
+2 == 2.0
+2 == 2
+2 == (2+0j)
+2 != [1]
+2 != (3,)
+2 != None
+2 != <Empty>
+2 == <Coerce 2>
+2 == <Cmp 2.0>
+2 != <RCmp 2>
+2.0 == 2
+2.0 == 2.0
+2.0 == 2
+2.0 == (2+0j)
+2.0 != [1]
+2.0 != (3,)
+2.0 != None
+2.0 != <Empty>
+2.0 == <Coerce 2>
+2.0 == <Cmp 2.0>
+2.0 != <RCmp 2>
+2 == 2
+2 == 2.0
+2 == 2
+2 == (2+0j)
+2 != [1]
+2 != (3,)
+2 != None
+2 != <Empty>
+2 == <Coerce 2>
+2 == <Cmp 2.0>
+2 != <RCmp 2>
+(2+0j) == 2
+(2+0j) == 2.0
+(2+0j) == 2
+(2+0j) == (2+0j)
+(2+0j) != [1]
+(2+0j) != (3,)
+(2+0j) != None
+(2+0j) != <Empty>
+(2+0j) == <Coerce 2>
+(2+0j) == <Cmp 2.0>
+(2+0j) != <RCmp 2>
+[1] != 2
+[1] != 2.0
+[1] != 2
+[1] != (2+0j)
+[1] == [1]
+[1] != (3,)
+[1] != None
+[1] != <Empty>
+[1] != <Coerce 2>
+[1] != <Cmp 2.0>
+[1] != <RCmp 2>
+(3,) != 2
+(3,) != 2.0
+(3,) != 2
+(3,) != (2+0j)
+(3,) != [1]
+(3,) == (3,)
+(3,) != None
+(3,) != <Empty>
+(3,) != <Coerce 2>
+(3,) != <Cmp 2.0>
+(3,) != <RCmp 2>
+None != 2
+None != 2.0
+None != 2
+None != (2+0j)
+None != [1]
+None != (3,)
+None == None
+None != <Empty>
+None != <Coerce 2>
+None != <Cmp 2.0>
+None != <RCmp 2>
+<Empty> != 2
+<Empty> != 2.0
+<Empty> != 2
+<Empty> != (2+0j)
+<Empty> != [1]
+<Empty> != (3,)
+<Empty> != None
+<Empty> == <Empty>
+<Empty> != <Coerce 2>
+<Empty> != <Cmp 2.0>
+<Empty> != <RCmp 2>
+<Coerce 2> == 2
+<Coerce 2> == 2.0
+<Coerce 2> == 2
+<Coerce 2> == (2+0j)
+<Coerce 2> != [1]
+<Coerce 2> != (3,)
+<Coerce 2> != None
+<Coerce 2> != <Empty>
+<Coerce 2> == <Coerce 2>
+<Coerce 2> != <Cmp 2.0>
+<Coerce 2> == <RCmp 2>
+<Cmp 2.0> == 2
+<Cmp 2.0> == 2.0
+<Cmp 2.0> == 2
+<Cmp 2.0> == (2+0j)
+<Cmp 2.0> != [1]
+<Cmp 2.0> != (3,)
+<Cmp 2.0> != None
+<Cmp 2.0> != <Empty>
+<Cmp 2.0> == <Coerce 2>
+<Cmp 2.0> == <Cmp 2.0>
+<Cmp 2.0> != <RCmp 2>
+<RCmp 2> != 2
+<RCmp 2> != 2.0
+<RCmp 2> != 2
+<RCmp 2> != (2+0j)
+<RCmp 2> != [1]
+<RCmp 2> != (3,)
+<RCmp 2> != None
+<RCmp 2> != <Empty>
+<RCmp 2> != <Coerce 2>
+<RCmp 2> != <Cmp 2.0>
+<RCmp 2> == <RCmp 2>

Lib/test/test_compare.py

@@ -17,7 +17,7 @@ class Coerce:
         if isinstance(other, Coerce):
             return self.arg, other.arg
         else:
-            return (self.arg, other)
+            return self.arg, other
 
 class Cmp:
     def __init__(self,arg):
@@ -40,18 +40,20 @@ class RCmp:
         return cmp(other, self.arg)
  
 
-candidates = [2, 2.2, 2L, 2+4j, [1], (2,), None, Empty(), Coerce(3),
-                Cmp(4), RCmp(5)]
+candidates = [2, 2.0, 2L, 2+0j, [1], (3,), None, Empty(), Coerce(2),
+                Cmp(2.0), RCmp(2L)]
 
 def test():
     for a in candidates:
         for b in candidates:
-            print "cmp(%s, %s)" % (a, b),
             try:
-                x = cmp(a, b)
+                x = a == b
             except:
-                print '... %s' % sys.exc_info(0)
+                print 'cmp(%s, %s) => %s' % (a, b, sys.exc_info()[0])
             else:
-                print '=', x
+                if x:
+                    print "%s == %s" % (a, b)
+                else:
+                    print "%s != %s" % (a, b)
 
 test()