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_io.py b/Lib/test/test_io.py
index c27dfd9..4a7cbe5 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -3900,6 +3900,16 @@
self.assertEqual(f.mode, "wb")
f.close()
+ with support.check_warnings(('', DeprecationWarning)):
+ f = self.open(support.TESTFN, "U")
+ self.assertEqual(f.name, support.TESTFN)
+ self.assertEqual(f.buffer.name, support.TESTFN)
+ self.assertEqual(f.buffer.raw.name, support.TESTFN)
+ self.assertEqual(f.mode, "U")
+ self.assertEqual(f.buffer.mode, "rb")
+ self.assertEqual(f.buffer.raw.mode, "rb")
+ f.close()
+
f = self.open(support.TESTFN, "w+")
self.assertEqual(f.mode, "w+")
self.assertEqual(f.buffer.mode, "rb+") # Does it really matter?
@@ -3913,13 +3923,6 @@
f.close()
g.close()
- def test_removed_u_mode(self):
- # "U" mode has been removed in Python 3.9
- for mode in ("U", "rU", "r+U"):
- with self.assertRaises(ValueError) as cm:
- self.open(support.TESTFN, mode)
- self.assertIn('invalid mode', str(cm.exception))
-
def test_open_pipe_with_append(self):
# bpo-27805: Ignore ESPIPE from lseek() in open().
r, w = os.pipe()