diff -r 677a9326b4d4 Lib/os.py
--- a/Lib/os.py	Mon Jul 09 18:16:11 2012 -0700
+++ b/Lib/os.py	Mon Jul 16 22:35:47 2012 +0300
@@ -695,6 +695,9 @@
     def copy(self):
         return dict(self)
 
+    def __copy__(self):
+        return self.copy()
+
     def setdefault(self, key, value):
         if key not in self:
             self[key] = value
diff -r 677a9326b4d4 Lib/test/test_os.py
--- a/Lib/test/test_os.py	Mon Jul 09 18:16:11 2012 -0700
+++ b/Lib/test/test_os.py	Mon Jul 16 22:35:47 2012 +0300
@@ -24,6 +24,7 @@
 import stat
 import locale
 import codecs
+import copy
 try:
     import threading
 except ImportError:
@@ -592,6 +593,16 @@
             self.assertSequenceEqual(os.get_exec_path({'PATH': b'abc'}),
                 ['abc'])
 
+    def test_copy(self):
+        env_copy = os.environ.copy()
+        env_copy_module = copy.copy(os.environ)
+        
+        env_copy['TEST_COPY'] = 'abc'
+        env_copy_module['TEST_COPY_MODULE'] = 'abc'
+        
+        self.assertNotIn('TEST_COPY', os.environ)
+        self.assertNotIn('TEST_COPY_MODULE', os.environ)
+
     @unittest.skipUnless(os.supports_bytes_environ,
                          "os.environb required for this test.")
     def test_environb(self):