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This: 1. Introduces a new override using the `pluggable_override` decorator. It is now possible to specify a custom way of getting XBlock's icon by defining `GET_UNIT_ICON_IMPL` in settings. 2. Introduces a way to add custom `XBLOCK_MIXINS` by defining `XBLOCK_EXTRA_MIXINS` in settings. This allows, e.g. to add new fields to XBlocks.
These directories specify the Python (and system) dependencies for the LMS and Studio. - ``edx`` contains the normal Python requirements files - ``edx-sandbox`` contains the requirements files for Codejail - ``constraints.txt`` is shared between the two (In a normal `OEP-18`_-compliant repository, the ``*.in`` and ``*.txt`` files would be directly in the requirements directory.) .. _OEP-18: https://github.com/edx/open-edx-proposals/blob/master/oeps/oep-0018-bp-python-dependencies.rst