Fix pylint violations.

problem_builder/tasks.py

@@ -73,7 +73,7 @@ def export_data(course_id, source_block_id_str, block_types, user_id, match_stri
 
     # Load the actual student submissions for each block in blocks_to_include.
     # Note this requires one giant query per block (all student submissions for each block, one block at a time)
-    for idx, block in enumerate(blocks_to_include, start=1):  # start=1 since first column is student ID
+    for block in blocks_to_include:
         # Get all of the most recent student submissions for this block:
         block_id = unicode(block.scope_ids.usage_id.replace(branch=None, version_guid=None))
         block_type = block.scope_ids.block_type

problem_builder/tests/integration/test_student_answers_dashboard.py

@@ -199,7 +199,7 @@ class StudentAnswersDashboardTest(SeleniumXBlockTest):
             successful=True, display_data=[[
                 'Test section', 'Test subsection', 'Test unit',
                 'Test type', 'Test question', 'Test answer', 'Test username'
-            ] for r in range(45)]),
+            ] for _ in range(45)]),
         'instructor_task': True,
         'instructor_task.models': MockInstructorTaskModelsModule(),
     })