Nah obviously not. I just listed what I know. I mean looking at the list you could maybe tell that I'm mostly interested in programming language implementation (I forgot to list all my Linux and Windows sysops skills that I've gained from years of managing said systems).
The end result is, that (1) my knowledge and skills extend way beyond any of my past or present job descriptions, and (2) (this is probably even more important for employers/productivity) that I'm capable of, and curious enough to actually want to, learning quickly/deeply and solving hard problems that might not have an obvious instant-knowledge-based solution.
I think that anyone that has ever had an interest to go "beyond" (in any way) the obvious, or immediately what's necessary in his/her day job, would built such a knowledge base - but could of course be completely unrelated to mine (e.g. networking specialist, cryptography geek, hardware/embedded engineer, ...).
But would you consider someone passionate if they said that they only care about learning a language/technology/framework that is marketable and doesn’t believe in learning for its own sake?
Unless the Python developer is actually writing C++, I don’t think he would ever need to learn the intricacies of C to be a good developer.
But take that opinion with a large grain of salt. I spent 12 years bit twiddling in C/C++, 10 in C#, and have been doing Python for a grand total of 6 months so I definitely haven’t done anything complicated with Python.