Refuse to operate on directories

[ChanceNCounter]

bak is only designed to work on files. It might someday get an option to work on directories, or perhaps a recursive "bak 'em all" method, because recursive dir copies aren't unheard of. In the meantime, however, bak should catch IsADirectoryError, and output an error instead of crashing.

[Serene-Arc]

Would you consider using pathlib for this project? I was going to write a pull request for this bug but using pathlib would make it a lot cleaner and easier to read. For a lot of stuff, pathlib is way better than os

[ChanceNCounter]

@Serene-Arc probably a good idea, yeah.

[Serene-Arc]

Do you want me to do that in a pull request?

[ChanceNCounter]

You're absolutely welcome to, or I'll look into it later today or tomorrow. Entirely up to you.