chore: drop six and refactor

[MaferMazu]

Description

This PR fully removes the six package and refactors some code.

Related to #326

Note

I think it is easier to review this PR by commit.

Details

• Remove six
• Remove the coerce_string_keys_to_text_type function because the keys in dictionaries are no longer unicode strings.
• Refactor: remove unused imports and pass
• Fix: syntax warning and a deprecated abstractproperty. More about abstractproperty: https://docs.python.org/3/library/abc.html#abc.abstractproperty
• Remove __future__ imports because our imports were for supporting Python < 3. Ref: https://docs.python.org/3/library/__future__.html#module-contents

How to test

Code

All the checks are passed.

Integration

Environment

• Have a tutor environment with Tutor v18.1.4
• Install codejail. You can follow the installation and usage process from the tutor-contrib-codejail README.
• Perform a dev launch

Data

• Import the MIT demo course running:

tutor dev do importdemocourse -r https://github.com/mitodl/mitx-grading-library -d course -v master

For more info: tutor dev do importdemocourse -h

• Create an admin user

tutor dev do createuser --staff --superuser admin admin@example.com

Test

1. Enter in Studio > MITx Grading Library > Content > Files
2. Remove the python_lib.zip and add this one:
   python_lib.zip

Note

If you want to create your python_lib from this version, you can clone the repo, enter in it, and then:

find mitxgraders voluptuous -type f ! -path "*/__pycache__/*" | zip python_lib.zip -@

3. Make sure the units are rendered and worked well.

Screencasts

Everything still works as expected.

Screencast.from.2024-11-15.17-20-41.webm