How to fix list index out of range

[deanhystad]

What arguments did you supply? None? When you run this program you need to provide:
2 goal labels
1 forbidden label
1 wall label

        self.goal_labels = [int(input_list[0]), int(input_list[1])]
        self.forbidden_label = int(input_list[2])
        self.wall_label = int(input_list[3])

I have no idea what any of that means.

I think it is a bad idea forcing the user to provide command line arguments. Command line arguments should be optional, and your program should provide appropriate default values when not arguments are not supplied.