Are the references to Python 2.7 still relevant?
The section describing the Open EdX platform mentions is has components still working with Python 2.7.
" Many edx-platform dependencies (e.g. xblock, completion) are bi-compatible with Python 2.7 (using six) and get tested on both versions. Details are in the tox.ini for those repos."
I have checked the xblock and completion repos and both dropped Python 2.7 support last year.
Are there other components in the full setup that are not fully migrated to Python 3?