> Are there developers that prefer both and constantly switch between them? Yes. I do. I regularly use about half-a-dozen different programming languages, with

> Are there developers that prefer both and constantly switch between them? Yes. I do. I regularly use about half-a-dozen different programming languages, with C, Python and Haskell being my weapons of choice (when I have a choice). I use Python for quick hacks where performance doesn't matter. I could do with Lua, Ruby or Perl, but I prefer Python because I know it and it's "batteries included". I've used Haskell a lot, and I use it for more complex tasks such as parsing or compiler projects. Back when I was at the Uni, I really aced some courses because I could do programming project works really fast, while relying on the static typing and some ad-hoc testing with QuickCheck. And I use C because there's no alternative for it in my day job (technically, Rust could do it now, but there are non-technical issues that prevent it so far). I also use it for some performance intensive scientific/math stuff as well as computer graphics.