[whymauri]

I'm going to echo the Insight Data Science Fellowship Program as, by far, the best in that space. Even then, please pick up a copy of Clean Code if you're from another field. That's a chronic issue with data science candidates.

[aparsons]

I think some of this has Python to blame. It’s very difficult to write idiomatically maintainable code in dynamic, scripting languages.

Now also consider that data wrangling is almost always highly coupled to one or more input formats, lots of index-via-literals, string manipulation, type conversions, field copying etc... I think I’d have trouble writing what others would consider Clean code in such a setting - and I’ve programmed for 40 years.