Issue #12760: Add a create mode to open(). Patch by David Townshend.
diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index 5954999..bea9395 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -2825,6 +2825,19 @@
self.assertTrue(wf.closed)
self.assertTrue(rf.closed)
+ def test_create_fail(self):
+ # 'x' mode fails if file is existing
+ with self.open(support.TESTFN, 'w'):
+ pass
+ self.assertRaises(FileExistsError, self.open, support.TESTFN, 'x')
+
+ def test_create_writes(self):
+ # 'x' mode opens for writing
+ with self.open(support.TESTFN, 'xb') as f:
+ f.write(b"spam")
+ with self.open(support.TESTFN, 'rb') as f:
+ self.assertEqual(b"spam", f.read())
+
class CMiscIOTest(MiscIOTest):
io = io