[Tkinter] MultiThreading Return value issue

[nilamo]

TypeError: Drive_Scanner() takes 2 positional arguments but 4 were given

Your function only has two params: a reference to the object (self), and the DriveLetter. But when the callback is triggered, tkinter is passing extra arguments, which is throwing an error. So the first step, is taking a peek at what else is getting passed, so you can handle it properly.

The easy way of doing so, is adding *args to the function definition, and then printing it out so you can see what's there.

The second error, about the directory_list, I'd rather see the entire error before commenting on. But it looks like you're trying to use a variable before creating it.