A few years ago in my previous company there was a major push to convert a lot of the codebase to Python. A byproduct of this conversion was an easier way to build UI using predefined widgets. Yet no one was using this functionality due to the mindset of years of TCL. I honestly hated TCL. So I took it upon myself to explore the entire new code base and go about building UI panels. Initially I just couldn't understand how the code mapped out until one day I just printed out some of the code and read it repeatedly till it made sense. The whole exercise was an eye opener.