Python Tkinter Window
window = tk.Tk()
w, h = window.winfo_screenwidth(), window.winfo_screenheight()
window.geometry("%dx%d+0+0" % (w, h))
Old-fashioned Otter
window = tk.Tk()
w, h = window.winfo_screenwidth(), window.winfo_screenheight()
window.geometry("%dx%d+0+0" % (w, h))