Strictly speaking the sys.exit() call is not a part of the language but a library function. It however affects the control flow not less than exceptions and probably even severer. So I decided that it would be a good idea to recognize the sys.exit() calls and highlight them explicitly.

A peculiar thing here is that the sys.exit() could look different depending on how the import is done.

Certainly, there is eval("...") call as well which is very hard to cover (and this case is not covered) but handling the most common cases is better than nothing.

As a matter of fact sys.exit() is internally implemented using exceptions so it makes sense to use similar graphics for sys.exit() and exceptions. This is what is done: the exception arrow icon is replaced with a stop sign icon and the graphics shape is shared. The result is that the sys.exit() calls are easily recognizable.