Bug #1653736: Complain about keyword arguments to time.isoformat.

Lib/test/test_datetime.py

@@ -1740,6 +1740,11 @@ class TestTime(HarmlessMixedComparison):
         self.assertEqual(t.isoformat(), "00:00:00.100000")
         self.assertEqual(t.isoformat(), str(t))
 
+    def test_1653736(self):
+        # verify it doesn't accept extra keyword arguments
+        t = self.theclass(second=1)
+        self.assertRaises(TypeError, t.isoformat, foo=3)
+
     def test_strftime(self):
         t = self.theclass(1, 2, 3, 4)
         self.assertEqual(t.strftime('%H %M %S'), "01 02 03")

Misc/NEWS

@@ -105,6 +105,8 @@ Core and builtins
 Extension Modules
 -----------------
 
+- Bug #1653736: Complain about keyword arguments to time.isoformat.
+
 - operator.count() now raises an OverflowError when the count reaches sys.maxint.
 
 - Bug #1575169: operator.isSequenceType() now returns False for subclasses of dict.

Modules/datetimemodule.c

@@ -3167,7 +3167,7 @@ time_str(PyDateTime_Time *self)
 }
 
 static PyObject *
-time_isoformat(PyDateTime_Time *self)
+time_isoformat(PyDateTime_Time *self, PyObject *unused)
 {
 	char buf[100];
 	PyObject *result;
@@ -3411,7 +3411,7 @@ time_reduce(PyDateTime_Time *self, PyObject *arg)
 
 static PyMethodDef time_methods[] = {
 
-	{"isoformat",   (PyCFunction)time_isoformat,	METH_KEYWORDS,
+	{"isoformat",   (PyCFunction)time_isoformat,	METH_NOARGS,
 	 PyDoc_STR("Return string in ISO 8601 format, HH:MM:SS[.mmmmmm]"
 	 	   "[+HH:MM].")},