diff --git a/common/lib/xmodule/xmodule/course_module.py b/common/lib/xmodule/xmodule/course_module.py
index 286f7bd1dc..085aca92dc 100644
--- a/common/lib/xmodule/xmodule/course_module.py
+++ b/common/lib/xmodule/xmodule/course_module.py
@@ -1211,23 +1211,23 @@ class CourseDescriptor(CourseFields, SequenceDescriptor):
                 for module_descriptor in yield_descriptor_descendents(child):
                     yield module_descriptor
 
-        for c in self.get_children():
-            for s in c.get_children():
-                if s.graded:
-                    xmoduledescriptors = list(yield_descriptor_descendents(s))
-                    xmoduledescriptors.append(s)
+        for chapter in self.get_children():
+            for section in chapter.get_children():
+                if section.graded:
+                    xmoduledescriptors = list(yield_descriptor_descendents(section))
+                    xmoduledescriptors.append(section)
 
                     # The xmoduledescriptors included here are only the ones that have scores.
                     section_description = {
-                        'section_descriptor': s,
-                        'xmoduledescriptors': filter(lambda child: child.has_score, xmoduledescriptors)
+                        'section_descriptor': section,
+                        'xmoduledescriptors': [child for child in xmoduledescriptors if child.has_score]
                     }
 
-                    section_format = s.format if s.format is not None else ''
+                    section_format = section.format if section.format is not None else ''
                     graded_sections[section_format] = graded_sections.get(section_format, []) + [section_description]
 
                     all_descriptors.extend(xmoduledescriptors)
-                    all_descriptors.append(s)
+                    all_descriptors.append(section)
 
         return {'graded_sections': graded_sections,
                 'all_descriptors': all_descriptors, }