Edited comments, ran pep8

common/djangoapps/terrain/steps.py

@@ -143,7 +143,7 @@ def log_in(username, password):
     assert(user is not None and user.is_active)
 
     # Send a fake HttpRequest to log the user in
-    # We need to process the request using 
+    # We need to process the request using
     # Session middleware and Authentication middleware
     # to ensure that session state can be stored
     request = HttpRequest()

lms/djangoapps/courseware/features/problems.py

@@ -215,7 +215,7 @@ def reset_problem(step):
 
 
 # Dictionaries that map problem types to the css selectors
-# for correct/incorrect marks.
+# for correct/incorrect/unanswered marks.
 # The elements are lists of selectors because a particular problem type
 # might be marked in multiple ways.
 # For example, multiple choice is marked incorrect differently