Minimize boilerplate when building Commands/Options

[nwatson22]

No description provided.

[nwatson22]

Current issue I'm having:
The Option class is ideally where we'll input every piece of data about an individual option, e.g. --debug.
It would be nice to impose some type restrictions on each Option, so it's declared as a specific type and its default parameter can only be of that type. However, when I use generics to tell the Option what type it is, there doesn't seem to be any good way in python to read that type at runtime, and when I try to pass the type in as a normal parameter of type type, then it doesn't accept union types, e.g. Int | None.

Edit: I solved this for now by using a separate class for each type of option we might want to have, some of which have special features, e.g. StringOption, BoolOption, EnumOption, ReadFileOption

[tothtamas28]

Consider introducing a dedicated value (a null object) for this, e.g.

NO_DEFAULT: Final = object()

[tothtamas28]

It'd be best to avoid the need for this class hierarchy. It is possible I'm missing something, but I think you can just add to Option all the attributes necessary to call add_argument.

[nwatson22]

I was looking to hide the argparse implementation details, like FileType, but I guess this is not really necessary.