How can I show a window created with Tkinter.Tk() outside visible screen? I need to make it much bigger than the desktop size, and show part of it defined by coordinates.
Another possible way is to insert a frame and resize that, eg: 
import tkinter as tk  
root = tk.Tk()
 frame = Frame(root, width = 1000, height = 1000)
 frame.pack()
 root.mainloop
The size of your window will then be determined by the frame, although the answer already given works just fine too
Tkinter window outside desktop