Index: Python/ast.c
===================================================================
--- Python/ast.c	(Revision 60048)
+++ Python/ast.c	(Arbeitskopie)
@@ -3238,6 +3238,9 @@
                         quote = *++s;
                         unicode = 1;
                 }
+                if (quote == 'b' || quote == 'B') {
+                        quote = *++s;
+                }
                 if (quote == 'r' || quote == 'R') {
                         quote = *++s;
                         rawmode = 1;
Index: Python/bltinmodule.c
===================================================================
--- Python/bltinmodule.c	(Revision 60048)
+++ Python/bltinmodule.c	(Arbeitskopie)
@@ -2446,6 +2446,7 @@
 	SETBUILTIN("True",		Py_True);
 	SETBUILTIN("basestring",	&PyBaseString_Type);
 	SETBUILTIN("bool",		&PyBool_Type);
+	SETBUILTIN("bytes",		&PyString_Type);
 	SETBUILTIN("buffer",		&PyBuffer_Type);
 	SETBUILTIN("classmethod",	&PyClassMethod_Type);
 #ifndef WITHOUT_COMPLEX
Index: Parser/tokenizer.c
===================================================================
--- Parser/tokenizer.c	(Revision 60048)
+++ Parser/tokenizer.c	(Arbeitskopie)
@@ -1263,6 +1263,14 @@
 	if (isalpha(c) || c == '_') {
 		/* Process r"", u"" and ur"" */
 		switch (c) {
+		case 'b':
+		case 'B':
+			c = tok_nextc(tok);
+			if (c == 'r' || c == 'R')
+				c = tok_nextc(tok);
+			if (c == '"' || c == '\'')
+				goto letter_quote;
+			break;
 		case 'r':
 		case 'R':
 			c = tok_nextc(tok);
Index: Lib/test/test_string.py
===================================================================
--- Lib/test/test_string.py	(Revision 60048)
+++ Lib/test/test_string.py	(Arbeitskopie)
@@ -106,8 +106,19 @@
         self.assertEqual(string.capwords('ABC-DEF-GHI', '-'), 'Abc-Def-Ghi')
         self.assertEqual(string.capwords('ABC-def DEF-ghi GHI'), 'Abc-def Def-ghi Ghi')
 
+class BytesAliasTest(unittest.TestCase):
+
+   def test_builtin(self):
+       self.assert_(str is bytes)
+
+   def test_syntax(self):
+       self.assertEqual(b"spam", "spam")
+       self.assertEqual(br"egg\foo", "egg\\foo")
+       self.assert_(type(b""), str)
+       self.assert_(type(br""), str)
+
 def test_main():
-    test_support.run_unittest(StringTest, ModuleTest)
+    test_support.run_unittest(StringTest, ModuleTest, BytesAliasTest)
 
 if __name__ == "__main__":
     test_main()