Convert test_userdict to use the collections.UserDict.

Fix-up collections.UserDict.__contains__ to work correctly when __missing__ is defined.
Fix-up Mapping.__eq__ to only match instances of Mapping.

Lib/_abcoll.py

@@ -379,10 +379,11 @@ class Mapping(metaclass=ABCMeta):
         return ValuesView(self)
 
     def __eq__(self, other):
-        return dict(self.items()) == dict(other.items())
+        return isinstance(other, Mapping) and \
+               dict(self.items()) == dict(other.items())
 
     def __ne__(self, other):
-        return dict(self.items()) != dict(other.items())
+        return not (self == other)
 
 class MappingView(metaclass=ABCMeta):
 

Lib/collections.py

@@ -135,6 +135,9 @@ class UserDict(MutableMapping):
     def __iter__(self):
         return iter(self.data)
 
+    # Modify __contains__ to work correctly when __missing__ is present
+    def __contains__(self, key):
+        return key in self.data
 
     # Now, add the methods in dicts but not in MutableMapping
     def __repr__(self): return repr(self.data)

Lib/test/test_userdict.py

@@ -2,7 +2,7 @@
 
 import unittest
 from test import test_support, mapping_tests
-import UserDict
+import collections
 
 d0 = {}
 d1 = {"one": 1}
@@ -12,36 +12,36 @@ d4 = {"one": None, "two": None}
 d5 = {"one": 1, "two": 1}
 
 class UserDictTest(mapping_tests.TestHashMappingProtocol):
-    type2test = UserDict.IterableUserDict
+    type2test = collections.UserDict
 
     def test_all(self):
         # Test constructors
-        u = UserDict.UserDict()
-        u0 = UserDict.UserDict(d0)
-        u1 = UserDict.UserDict(d1)
-        u2 = UserDict.IterableUserDict(d2)
+        u = collections.UserDict()
+        u0 = collections.UserDict(d0)
+        u1 = collections.UserDict(d1)
+        u2 = collections.UserDict(d2)
 
-        uu = UserDict.UserDict(u)
-        uu0 = UserDict.UserDict(u0)
-        uu1 = UserDict.UserDict(u1)
-        uu2 = UserDict.UserDict(u2)
+        uu = collections.UserDict(u)
+        uu0 = collections.UserDict(u0)
+        uu1 = collections.UserDict(u1)
+        uu2 = collections.UserDict(u2)
 
         # keyword arg constructor
-        self.assertEqual(UserDict.UserDict(one=1, two=2), d2)
+        self.assertEqual(collections.UserDict(one=1, two=2), d2)
         # item sequence constructor
-        self.assertEqual(UserDict.UserDict([('one',1), ('two',2)]), d2)
-        self.assertEqual(UserDict.UserDict(dict=[('one',1), ('two',2)]), d2)
+        self.assertEqual(collections.UserDict([('one',1), ('two',2)]), d2)
+        self.assertEqual(collections.UserDict(dict=[('one',1), ('two',2)]), d2)
         # both together
-        self.assertEqual(UserDict.UserDict([('one',1), ('two',2)], two=3, three=5), d3)
+        self.assertEqual(collections.UserDict([('one',1), ('two',2)], two=3, three=5), d3)
 
         # alternate constructor
-        self.assertEqual(UserDict.UserDict.fromkeys('one two'.split()), d4)
-        self.assertEqual(UserDict.UserDict().fromkeys('one two'.split()), d4)
-        self.assertEqual(UserDict.UserDict.fromkeys('one two'.split(), 1), d5)
-        self.assertEqual(UserDict.UserDict().fromkeys('one two'.split(), 1), d5)
+        self.assertEqual(collections.UserDict.fromkeys('one two'.split()), d4)
+        self.assertEqual(collections.UserDict().fromkeys('one two'.split()), d4)
+        self.assertEqual(collections.UserDict.fromkeys('one two'.split(), 1), d5)
+        self.assertEqual(collections.UserDict().fromkeys('one two'.split(), 1), d5)
         self.assert_(u1.fromkeys('one two'.split()) is not u1)
-        self.assert_(isinstance(u1.fromkeys('one two'.split()), UserDict.UserDict))
-        self.assert_(isinstance(u2.fromkeys('one two'.split()), UserDict.IterableUserDict))
+        self.assert_(isinstance(u1.fromkeys('one two'.split()), collections.UserDict))
+        self.assert_(isinstance(u2.fromkeys('one two'.split()), collections.UserDict))
 
         # Test __repr__
         self.assertEqual(str(u0), str(d0))
@@ -59,7 +59,7 @@ class UserDictTest(mapping_tests.TestHashMappingProtocol):
         self.assertRaises(KeyError, u1.__getitem__, "two")
 
         # Test __setitem__
-        u3 = UserDict.UserDict(u2)
+        u3 = collections.UserDict(u2)
         u3["two"] = 2
         u3["three"] = 3
 
@@ -74,11 +74,11 @@ class UserDictTest(mapping_tests.TestHashMappingProtocol):
         # Test copy()
         u2a = u2.copy()
         self.assertEqual(u2a, u2)
-        u2b = UserDict.UserDict(x=42, y=23)
+        u2b = collections.UserDict(x=42, y=23)
         u2c = u2b.copy() # making a copy of a UserDict is special cased
         self.assertEqual(u2b, u2c)
 
-        class MyUserDict(UserDict.UserDict):
+        class MyUserDict(collections.UserDict):
             def display(self): print(self)
 
         m2 = MyUserDict(u2)
@@ -101,15 +101,9 @@ class UserDictTest(mapping_tests.TestHashMappingProtocol):
             self.assertEqual(i in u0, i in d0)
 
         # Test update
-        t = UserDict.UserDict()
+        t = collections.UserDict()
         t.update(u2)
         self.assertEqual(t, u2)
-        class Items:
-            def items(self):
-                return (("x", 42), ("y", 23))
-        t = UserDict.UserDict()
-        t.update(Items())
-        self.assertEqual(t, {"x": 42, "y": 23})
 
         # Test get
         for i in u2.keys():
@@ -127,13 +121,13 @@ class UserDictTest(mapping_tests.TestHashMappingProtocol):
         self.assertEqual(set(ikeys), set(keys))
 
         # Test setdefault
-        t = UserDict.UserDict()
+        t = collections.UserDict()
         self.assertEqual(t.setdefault("x", 42), 42)
         self.assert_("x" in t)
         self.assertEqual(t.setdefault("x", 23), 42)
 
         # Test pop
-        t = UserDict.UserDict(x=42)
+        t = collections.UserDict(x=42)
         self.assertEqual(t.pop("x"), 42)
         self.assertRaises(KeyError, t.pop, "x")
         self.assertEqual(t.pop("x", 1), 1)
@@ -141,19 +135,19 @@ class UserDictTest(mapping_tests.TestHashMappingProtocol):
         self.assertEqual(t.pop("x", 1), 42)
 
         # Test popitem
-        t = UserDict.UserDict(x=42)
+        t = collections.UserDict(x=42)
         self.assertEqual(t.popitem(), ("x", 42))
         self.assertRaises(KeyError, t.popitem)
 
     def test_missing(self):
         # Make sure UserDict doesn't have a __missing__ method
-        self.assertEqual(hasattr(UserDict, "__missing__"), False)
+        self.assertEqual(hasattr(collections.UserDict, "__missing__"), False)
         # Test several cases:
         # (D) subclass defines __missing__ method returning a value
         # (E) subclass defines __missing__ method raising RuntimeError
         # (F) subclass sets __missing__ instance variable (no effect)
         # (G) subclass doesn't define __missing__ at a all
-        class D(UserDict.UserDict):
+        class D(collections.UserDict):
             def __missing__(self, key):
                 return 42
         d = D({1: 2, 3: 4})
@@ -162,7 +156,7 @@ class UserDictTest(mapping_tests.TestHashMappingProtocol):
         self.assert_(2 not in d)
         self.assert_(2 not in d.keys())
         self.assertEqual(d[2], 42)
-        class E(UserDict.UserDict):
+        class E(collections.UserDict):
             def __missing__(self, key):
                 raise RuntimeError(key)
         e = E()
@@ -172,11 +166,11 @@ class UserDictTest(mapping_tests.TestHashMappingProtocol):
             self.assertEqual(err.args, (42,))
         else:
             self.fail("e[42] didn't raise RuntimeError")
-        class F(UserDict.UserDict):
+        class F(collections.UserDict):
             def __init__(self):
                 # An instance variable __missing__ should have no effect
                 self.__missing__ = lambda key: None
-                UserDict.UserDict.__init__(self)
+                collections.UserDict.__init__(self)
         f = F()
         try:
             f[42]
@@ -184,7 +178,7 @@ class UserDictTest(mapping_tests.TestHashMappingProtocol):
             self.assertEqual(err.args, (42,))
         else:
             self.fail("f[42] didn't raise KeyError")
-        class G(UserDict.UserDict):
+        class G(collections.UserDict):
             pass
         g = G()
         try: