bpo-39674: Revert "bpo-37330: open() no longer accept 'U' in file mode (GH-16959)" (GH-18767)
This reverts commit e471e72977c83664f13d041c78549140c86c92de.
The mode will be removed from Python 3.10.
diff --git a/Lib/test/test_codecs.py b/Lib/test/test_codecs.py
index dcdd574..54a3520 100644
--- a/Lib/test/test_codecs.py
+++ b/Lib/test/test_codecs.py
@@ -712,23 +712,11 @@
self.addCleanup(support.unlink, support.TESTFN)
with open(support.TESTFN, 'wb') as fp:
fp.write(s)
- with codecs.open(support.TESTFN, 'r',
- encoding=self.encoding) as reader:
+ with support.check_warnings(('', DeprecationWarning)):
+ reader = codecs.open(support.TESTFN, 'U', encoding=self.encoding)
+ with reader:
self.assertEqual(reader.read(), s1)
- def test_invalid_modes(self):
- for mode in ('U', 'rU', 'r+U'):
- with self.assertRaises(ValueError) as cm:
- codecs.open(support.TESTFN, mode, encoding=self.encoding)
- self.assertIn('invalid mode', str(cm.exception))
-
- for mode in ('rt', 'wt', 'at', 'r+t'):
- with self.assertRaises(ValueError) as cm:
- codecs.open(support.TESTFN, mode, encoding=self.encoding)
- self.assertIn("can't have text and binary mode at once",
- str(cm.exception))
-
-
class UTF16LETest(ReadTest, unittest.TestCase):
encoding = "utf-16-le"
ill_formed_sequence = b"\x80\xdc"