diff --git a/common/lib/xmodule/xmodule/self_assessment_module.py b/common/lib/xmodule/xmodule/self_assessment_module.py
index d76786007a..d8994d1187 100644
--- a/common/lib/xmodule/xmodule/self_assessment_module.py
+++ b/common/lib/xmodule/xmodule/self_assessment_module.py
@@ -7,20 +7,21 @@ Parses xml definition file--see below for exact format.
 
 import copy
 from fs.errors import ResourceNotFoundError
+import itertools
+import json
 import logging
-import os
-import sys
 from lxml import etree
 from lxml.html import rewrite_links
 from path import path
-import json
-from progress import Progress
+import os
+import sys
 
 from pkg_resources import resource_string
 
 from .capa_module import only_one, ComplexEncoder
 from .editing_module import EditingDescriptor
 from .html_checker import check_html
+from progress import Progress
 from .stringify import stringify_children
 from .x_module import XModule
 from .xml_module import XmlDescriptor