Index: Python/_warnings.c
===================================================================
--- Python/_warnings.c	(revision 76258)
+++ Python/_warnings.c	(working copy)
@@ -839,26 +839,29 @@
 static PyObject *
 init_filters(void)
 {
-    PyObject *filters = PyList_New(3);
+    PyObject *filters = PyList_New(4);
     const char *bytes_action;
     if (filters == NULL)
         return NULL;
 
     PyList_SET_ITEM(filters, 0,
+		    create_filter(PyExc_DeprecationWarning, "ignore"));
+    PyList_SET_ITEM(filters, 1,
                     create_filter(PyExc_PendingDeprecationWarning, "ignore"));
-    PyList_SET_ITEM(filters, 1, create_filter(PyExc_ImportWarning, "ignore"));
+    PyList_SET_ITEM(filters, 2, create_filter(PyExc_ImportWarning, "ignore"));
     if (Py_BytesWarningFlag > 1)
         bytes_action = "error";
     else if (Py_BytesWarningFlag)
         bytes_action = "default";
     else
         bytes_action = "ignore";
-    PyList_SET_ITEM(filters, 2, create_filter(PyExc_BytesWarning,
+    PyList_SET_ITEM(filters, 3, create_filter(PyExc_BytesWarning,
                     bytes_action));
 
     if (PyList_GET_ITEM(filters, 0) == NULL ||
         PyList_GET_ITEM(filters, 1) == NULL ||
-        PyList_GET_ITEM(filters, 2) == NULL) {
+        PyList_GET_ITEM(filters, 2) == NULL ||
+	PyList_GET_ITEM(filters, 3) == NULL) {
         Py_DECREF(filters);
         return NULL;
     }
Index: Lib/warnings.py
===================================================================
--- Lib/warnings.py	(revision 76258)
+++ Lib/warnings.py	(working copy)
@@ -383,8 +383,8 @@
 # Module initialization
 _processoptions(sys.warnoptions)
 if not _warnings_defaults:
-    simplefilter("ignore", category=PendingDeprecationWarning, append=1)
-    simplefilter("ignore", category=ImportWarning, append=1)
+    for cls in (DeprecationWarning, PendingDeprecationWarning, ImportWarning):
+        simplefilter("ignore", category=cls, append=1)
     bytes_warning = sys.flags.bytes_warning
     if bytes_warning > 1:
         bytes_action = "error"