Just some personal feelings on what I'm actually doing when I'm working with Python and Nim:
Python:
Nim:
Python is no doubt quick to write, but debugging is very painful even with various powerful testing and debugging tools. Nim requires me to think a lot about how to design my code, probably due to the almighty macro system. I seldom doing more than echo in debugging. When it compiles, I'm almost confident it's basically correct.
I'd say designing and writing code are the most interesting parts of programming. The next in line is googling language features. I think nobody want to spend a whole day (or week) writing tests or debugging. So it's clear which of the two languages is my preference.
And C BTW. I don't write a lot of C code, but It's hard to forget all those time I spent with GDB.
C:
The pie charts don't show total amount of time required to achieve the same functionality, or expressiveness, or speed, so again they are just personal feelings and have nothing to do with language rankings.