SF patch #1359365: cStringIO.StringIO.isatty() will raise a ValueError

now if close() has been called before (like file and StringIO.StringIO do)

Lib/test/test_StringIO.py

@@ -75,6 +75,13 @@ class TestGenericStringIO(unittest.TestCase):
         f.close()
         self.assertEqual(f.closed, True)
 
+    def test_isatty(self):
+        f = self.MODULE.StringIO()
+        self.assertRaises(TypeError, f.isatty, None)
+        self.assertEqual(f.isatty(), False)
+        f.close()
+        self.assertRaises(ValueError, f.isatty)
+
     def test_iterator(self):
         eq = self.assertEqual
         unless = self.failUnless

Misc/NEWS

@@ -449,6 +449,9 @@ Library
   codecs.getincrementaldecoder() and codecs.getincrementalencoder() have
   been added.
 
+- SF patch #1359365: cStringIO.StringIO.isatty() will raise a ValueError
+  now if close() has been called before (like file and StringIO.StringIO do)
+
 - A regrtest option -w was added to re-run failed tests in verbose mode.
 
 - Patch #1446372: quit and exit can now be called from the interactive

Modules/cStringIO.c

@@ -144,7 +144,8 @@ PyDoc_STRVAR(IO_isatty__doc__, "isatty(): always returns 0");
 
 static PyObject *
 IO_isatty(IOobject *self, PyObject *unused) {
-	Py_INCREF(Py_False);
+        if (!IO__opencheck(self)) return NULL;
+        Py_INCREF(Py_False);
         return Py_False;
 }