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Some web resources for documentation:
https://blogs.oracle.com/datascience/how-to-write-production-level-code-for-data-science-projects
https://towardsdatascience.com/why-you-should-document-your-work-as-a-data-scientist-a265af8a373
https://medium.com/@andrewgoldis/how-to-document-source-code-responsibly-2b2f303aa525