Add __repr__ method to Atom

Having atom name in its representation helps a lot
when debugging.

Change-Id: I8cb7054b95a8810a7fe3893ba579e9f9e9facd8e

taskflow/atom.py

@@ -150,6 +150,9 @@ class Atom(object):
     def __str__(self):
         return "%s==%s" % (self.name, misc.get_version_string(self))
 
+    def __repr__(self):
+        return '<%s %s>' % (reflection.get_class_name(self), self)
+
     @property
     def provides(self):
         """Any outputs this atom produces."""

taskflow/tests/unit/test_task.py

@@ -60,6 +60,14 @@ class TaskTest(test.TestCase):
         self.assertEqual(my_task.name,
                          '%s.%s' % (__name__, 'MyTask'))
 
+    def test_task_str(self):
+        my_task = MyTask(name='my')
+        self.assertEqual(str(my_task), 'my==1.0')
+
+    def test_task_repr(self):
+        my_task = MyTask(name='my')
+        self.assertEqual(repr(my_task), '<%s.MyTask my==1.0>' % __name__)
+
     def test_no_provides(self):
         my_task = MyTask()
         self.assertEqual(my_task.save_as, {})