The ideas here are good and in line with OEP-45, but we have not
yet had a chance to implement them in edx-platform
Furthermore, recent conversations have made us consider
revisiting the "Don't use YAML files, just python modules"
alternative described in the ADR. Particularly, Tutor has
not been able to use pure YAML to configure edx-platform,
and has fallen back on having separate .py settings files.
This makes us think that we either need to expose
more power through the YAML interface, or we need to
re-embrace .py settings files.
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