[Tkinter] Tkinter classes

[Yoriz]

I'm expecting to left part (FrameLeft (yellow)) have half of the window's width

It does

and right part (FrameRight (blue frame and Notebook)) take the other half.

Also does

The blue frame and Notebook's frame should take equal size.

They do
This is no longer about classes , is the classes question resolved ?
If it is this is now a new question about how to layout frames.