Command Line Program

I've been working on making the contrast curve program into a program that can be executed directly from the command line.

Yesterday I attempted to at first to make a rectangle selector that allowed users to make a subplot and contrast curve by creating a rectangle on the FITS image. Unfortunately... the code was difficult for me to understand and since I couldn't find the source code, it ended up being easier to just abandon the whole idea.

But today I'm definitely making much more progress! This morning I read up on some different command line functions and how to write Python files that required input from a command line. The current problem I have is that it's hard for me to load the actual FITS file onto command line, so I can't show you any examples just yet (since I can't actually make my code work on a file).

Tim has been kind enough to teach me a bit about exception handling and the such. I'm assuming I'm doing something simple wrong and will continue to figure out why my fits file directories are "never found".

**Edit:
The fits file load now so that the programs will execute without error. However, I barely even have a chance to see anything load up before the program terminates again. Huh. I need to figure out how to make the program "pause".

Learned:
-Loading Python scripts in command line
-Using functions in Python that allows users to input info from command line
-Exception Handling
Problems/To-Do:
-Finish up the program.
-Figure out how to "pause" it.
-Test my contrast curve program against other contrast curves!