diff --git a/Lib/datetime.py b/Lib/datetime.py
index b95536f..76a6f95 100644
--- a/Lib/datetime.py
+++ b/Lib/datetime.py
@@ -454,20 +454,18 @@
         return self
 
     def __repr__(self):
-        if self._microseconds:
-            return "%s.%s(%d, %d, %d)" % (self.__class__.__module__,
-                                          self.__class__.__qualname__,
-                                          self._days,
-                                          self._seconds,
-                                          self._microseconds)
+        args = []
+        if self._days:
+            args.append("days=%d" % self._days)
         if self._seconds:
-            return "%s.%s(%d, %d)" % (self.__class__.__module__,
-                                      self.__class__.__qualname__,
-                                      self._days,
-                                      self._seconds)
-        return "%s.%s(%d)" % (self.__class__.__module__,
+            args.append("seconds=%d" % self._seconds)
+        if self._microseconds:
+            args.append("microseconds=%d" % self._microseconds)
+        if not args:
+            args.append('0')
+        return "%s.%s(%s)" % (self.__class__.__module__,
                               self.__class__.__qualname__,
-                              self._days)
+                              ', '.join(args))
 
     def __str__(self):
         mm, ss = divmod(self._seconds, 60)
diff --git a/Lib/test/datetimetester.py b/Lib/test/datetimetester.py
index b25e6c1..2200888 100644
--- a/Lib/test/datetimetester.py
+++ b/Lib/test/datetimetester.py
@@ -658,11 +658,21 @@
     def test_repr(self):
         name = 'datetime.' + self.theclass.__name__
         self.assertEqual(repr(self.theclass(1)),
-                         "%s(1)" % name)
+                         "%s(days=1)" % name)
         self.assertEqual(repr(self.theclass(10, 2)),
-                         "%s(10, 2)" % name)
+                         "%s(days=10, seconds=2)" % name)
         self.assertEqual(repr(self.theclass(-10, 2, 400000)),
-                         "%s(-10, 2, 400000)" % name)
+                         "%s(days=-10, seconds=2, microseconds=400000)" % name)
+        self.assertEqual(repr(self.theclass(seconds=60)),
+                         "%s(seconds=60)" % name)
+        self.assertEqual(repr(self.theclass()),
+                         "%s(0)" % name)
+        self.assertEqual(repr(self.theclass(microseconds=100)),
+                         "%s(microseconds=100)" % name)
+        self.assertEqual(repr(self.theclass(days=1, microseconds=100)),
+                         "%s(days=1, microseconds=100)" % name)
+        self.assertEqual(repr(self.theclass(seconds=1, microseconds=100)),
+                         "%s(seconds=1, microseconds=100)" % name)
 
     def test_roundtrip(self):
         for td in (timedelta(days=999999999, hours=23, minutes=59,
diff --git a/Lib/test/test_datetime.py b/Lib/test/test_datetime.py
index d659f36..bb22871 100644
--- a/Lib/test/test_datetime.py
+++ b/Lib/test/test_datetime.py
@@ -50,6 +50,8 @@
         cls.tearDownClass = tearDownClass
     all_test_classes.extend(test_classes)
 
+    all_test_classes.extend(test_classes)
+
 def test_main():
     run_unittest(*all_test_classes)