Updated the file as suggested

ran python-modernize and isort on files mentioned in INCR-410

Updated the file as suggested

changes made to comply with quality

ran python-modernize and isort on files mentioned in INCR-410

Updated the file as suggested

changes made to comply with quality

A popular convention is to have user accounts stored in a separate authentication
database. This change add support for configuring edx-platform to work with
such a setup.

The `NoneType` object is not available from the `types` module in
python 3. This is a workaronud to deal with that.

changes made to comply with quality

changes made to comply with quality

changes made to comply with quality

advanced problems so that they do not become uneditable.

now that we install it from an external repository.

* INCR-245: Make compatible with Python 3.x without breaking Python 2.7 support > common/lib/capa/capa/safe_exec

* INCR-245: Add absolute_import to CODE_PROLOG

Some deprecated functionality has been removed:

- Reading data field and transforms being applied in the init() method.
- The source field.
- The source_visible attribute.

* INCR-413: Run python-modernize and isort

* INCR-413: Fix for text_type usage

Augment content_type_gating tests to detect the failure case from the original REVMI-34 implementation

* INCR-230 - Run python-modernize and isort on common/lib/xmodule/xmodule, plus a few minor fixes suggested by Jeremy

* INCR-229 ran modernize on common/lib/xmodule/xmodule/[a-g]*.py except for graders.py

* fix a couple xss-commit-linter issues

* incr-172

* incr-177 run modernize

* fixed bug due to running modernize

* INCR-214: python-modernize on common/lib/xmodule/xmodule/modulestore/tests

* Running isort on common/lib/xmodule/xmodule/modulestore/tests

* Resolving issues with mangled comments and fixing int/long test

* INCR-227: python-modernize on common/lib/xmodule/xmodule/video_module, partitions, and util

* pylint will ignore imports from six

* INCR-227 Fixing mangled comments and variable names

* INCR-226 run modernize on common/lib/xmodule/xmodule/modulestore/mongo, split_mongo, and perf_tests

* fix pep8 error

This is part of a larger effort to split packages out into independent,
composable, PyPI installable Python packages.

While this package itself isn't monumental, it represents the bottom of
the dependecy tree and can be split out before any other packages.