Use `sys.exit` instead of `exit`

[42B]

https://github.com/ncorbuk/SubZone/blob/71dfa0e6b6bfd143a848387d937f4d0d61aec94f/subzone.py#L125

The site module (which is imported automatically during startup, except if the -S command-line option is given) adds several constants to the built-in namespace. They are useful for the interactive interpreter shell and should not be used in programs.

• https://docs.python.org/3/library/constants.html?highlight=exit#constants-added-by-the-site-module

• https://docs.python.org/3/library/sys.html#sys.exit

[ncorbuk]

Yep thanks changed it now

[42B]

You should really work on writing proper commit messages. Using the same phrase over and over is not descriptive at all.

Plus, you can close these issues automatically as part of the commit message instead of always having to manually do it.

• https://help.github.com/articles/closing-issues-using-keywords/