Run 2to3 -f future . -w

This will remove imports from __future__ that are no longer needed.

https://docs.python.org/3.5/library/2to3.html#2to3fixer-future

lms/djangoapps/instructor_task/management/commands/fail_old_tasks.py

@@ -1,7 +1,7 @@
 """
 Commands to fail old tasks
 """
-from __future__ import absolute_import, print_function, unicode_literals
+
 
 from datetime import datetime
 from textwrap import dedent

lms/djangoapps/instructor_task/management/commands/tests/test_fail_old_tasks.py

@@ -1,7 +1,7 @@
 """
 Tests for failing old tasks
 """
-from __future__ import absolute_import
+
 
 from datetime import datetime