* INCR-233: Run python-modernize and isort on openedx/core/djangoapps/django_comment_common
* INCR-233: Fixes for basestring type as the six.string_types is tuple
* INCR-233: Grouped absolute_import and unicode_literals imports
* INCR-233: Grouped absolute_import and unicode_literals imports for migrations
* INCR-244: Make compatible with Python 3.x without breaking Python 2.7 support on common/test/acceptance/pages [common, xblock]
* INCR-244: Add missing module docstring and fix for six import
* INCR-244: Update module docstring
More than 70% of the execution time is spent in CPU. The change of
query is to avoid the massive course_id__in the GeneratedCertificate
was doing on CourseOverview
PROD-67
* INCR-248: Make compatible with Python 3.x without breaking Python 2.7 support --> common/djangoapps/xblock_django
* INCR-248: Grouped absolute_import and unicode_literals imports
* INCR-248: Grouped absolute_import and unicode_literals imports for migrations
* INCR-249: Make compatible with Python 3.x without breaking Python 2.7 support --> openedx/core/djangoapps/content/block_structure
* INCR-249: Grouped six package
* INCR-249: Remove the duplicate lines for absolute_import
* INCR-239: Run python-modernize and isort on openedx/core/djangoapps/programs [tests, tasks]
* INCR-239: Grouped six package and represent unused variables with _
* INCR-211: run python-modernize and isort to support python2 --> python3 transition
* INCR-211: fix pylint errors.
Removed unused module import request and error.
Used import as to avoid too deep a function call.
Altering imports and using suppression of pylint's import error.
* INCR-211: ignore pylint's import error from six module.
* INCR-211: remove unused modules. Ignore pylint import error from six module.
* INCR-211: ignore pylint's import error from six module. Group imports.
* INCR-211: disable error of 'must be called with literal string'
The specific context for this error means we can disable this.
* INCR-211: change import to satisfy pylint by renaming import
* INCR-211: fix imports so six.unichr works.
