resize-window-disabled.py

from tkinter import *

root = Tk()

w, h = root.winfo_screenwidth(), root.winfo_screenheight() # Get the height and width of window

root.geometry("%dx%d+0+0" % (w, h)) # Set app size respective to window size

root.resizable(0,0) # Resize window Disable

root.title("Window Resize Disabled")

root.mainloop()