Issue #5788: `datetime.timedelta` objects get a new `total_seconds()` method returning
the total number of seconds in the duration.  Patch by Brian Quinlan.
diff --git a/Lib/test/test_datetime.py b/Lib/test/test_datetime.py
index ad36398..1fb3d1b 100644
--- a/Lib/test/test_datetime.py
+++ b/Lib/test/test_datetime.py
@@ -266,6 +266,13 @@
         self.assertEqual(td.seconds, seconds)
         self.assertEqual(td.microseconds, us)
 
+    def test_total_seconds(self):
+        td = timedelta(days=365)
+        self.assertEqual(td.total_seconds(), 31536000.0)
+        for total_seconds in [123456.789012, -123456.789012, 0.123456, 0, 1e6]:
+            td = timedelta(seconds=total_seconds)
+            self.assertEqual(td.total_seconds(), total_seconds)
+
     def test_carries(self):
         t1 = timedelta(days=100,
                        weeks=-7,