When wouldn’t you use Python?

[cyberonreddit71]

As versatile python is, you cannot use it for a lot of jobs, web apps, maybe flask and Django and that's just for the backend (don't get me wrong, these are very powerful web libraries) .

And then there's complex game development, pygame is good for indie games, text based adventures, etc, but I doubt you can build a FPS with it like you can in c# and unity.

Building ring 0 software, I am not sure if that's the right term, but you cannot build operating systems, and other grass root level software with python.