n2o
Referring to learning Python: I originally bought Sublime because the Python Crash Course book I'm studying recommended it. I thought it was convenient that it was available for Windows and Linux, and its feature set looked pretty impressive. I'm at a point in my life when the cost wasn't a deal-breaker.
But by page 115 in the book, I was wondering why it kept pointing out errors in my code when I could find nothing wrong with it. It was very annoying. I'm new to Python, but I've spent many years writing C# code, so I'm not new to basic coding principles.
So, since I've had decades of using Visual Studio, I decided to try Visual Studio Code instead. I installed the Python debugger and every file I'd saved worked perfectly. Every time I pressed <F5> the examples ran to completion and produced the output I expected.
I'm no longer interested in why this happened. I just thought I'd mention it in case someone else has un-explainable issues with Sublime. I now wish I'd used it a while before paying for it!