Drop support for the "ur" string prefix

Lib/test/test_strlit.py

 r"""Test correct treatment of various string literals by the parser.
 
 There are four types of string literals:
 
     'abc'             -- normal str
     r'abc'            -- raw str
     b'xyz'            -- normal bytes
     br'xyz' | rb'xyz' -- raw bytes
 
 The difference between normal and raw strings is of course that in a
@@ skipping 104 matching lines @@
         self.assertEqual(eval(r""" br'\u1881' """), b"\\" + b"u1881")
         self.assertEqual(eval(r""" rb'\u1881' """), b"\\" + b"u1881")
         self.assertRaises(SyntaxError, eval, """ br'\u1881' """)
         self.assertRaises(SyntaxError, eval, """ rb'\u1881' """)
         self.assertRaises(SyntaxError, eval, """ bb'' """)
         self.assertRaises(SyntaxError, eval, """ rr'' """)
         self.assertRaises(SyntaxError, eval, """ brr'' """)
         self.assertRaises(SyntaxError, eval, """ bbr'' """)
         self.assertRaises(SyntaxError, eval, """ rrb'' """)
         self.assertRaises(SyntaxError, eval, """ rbb'' """)
+
+    def test_eval_str_u(self):
+        self.assertEqual(eval(""" u'x' """), 'x')
+        self.assertEqual(eval(""" U'\u00e4' """), 'ä')
+        self.assertEqual(eval(""" u'\N{LATIN SMALL LETTER A WITH DIAERESIS}' """), 'ä')
+        self.assertRaises(SyntaxError, eval, """ ur'' """)
+        self.assertRaises(SyntaxError, eval, """ ru'' """)

[storchaka, 2012/06/17 18:35:21]

Are ub'' and bu'' tested somewhere?

 
     def check_encoding(self, encoding, extra=""):
         modname = "xx_" + encoding.replace("-", "_")
         fn = os.path.join(self.tmpdir, modname + ".py")
         f = open(fn, "w", encoding=encoding)
         try:
             f.write(TEMPLATE % encoding)
             f.write(extra)
         finally:
             f.close()
@@ skipping 19 matching lines @@
 
     def test_file_latin9(self):
         self.check_encoding("latin9")
 
 
 def test_main():
     test.support.run_unittest(__name__)
 
 if __name__ == "__main__":
     test_main()