Display rounded problem results.

common/lib/xmodule/xmodule/progress.py

@@ -116,12 +116,15 @@ class Progress(object):
         return not self.__eq__(other)
 
     def __str__(self):
-        ''' Return a string representation of this string.
+        '''Return a string representation of this string. Rounds results to
+        two decimal places, stripping out any trailing zeroes.
 
         subclassing note: implemented in terms of frac().
+
         '''
         (a, b) = self.frac()
-        return "{0}/{1}".format(a, b)
+        display = lambda n: '{:.2f}'.format(n).rstrip('0').rstrip('.')
+        return "{0}/{1}".format(display(a), display(b))
 
     @staticmethod
     def add_counts(a, b):

common/lib/xmodule/xmodule/tests/test_progress.py

@@ -81,6 +81,9 @@ class ProgressTest(unittest.TestCase):
         self.assertEqual(str(self.not_started), "0/17")
         self.assertEqual(str(self.part_done), "2/6")
         self.assertEqual(str(self.done), "7/7")
+        self.assertEqual(str(Progress(2.1234, 7)), '2.12/7')
+        self.assertEqual(str(Progress(2.0034, 7)), '2/7')
+        self.assertEqual(str(Progress(0.999, 7)), '1/7')
 
     def test_ternary_str(self):
         self.assertEqual(self.not_started.ternary_str(), "none")