How to write a production-level code in Data Science? by Venkatesh Pappakrishnan via @TDataScience

The ability to write production-level code is one of the most sought-after skills for a data scientist role. If you are new to it, here are some tips.

I would add that comments are crucial not just for maintenance or reviews but to help remind you what you wanted to achieve. I also find statements to print out variables are various parts of the code that are then commented out are useful for debugging.