root.state('zoomed') code example

Example 1: Tkinter maximise window

import Tkinter

MyRoot = Tkinter.Tk()
MyRoot.state("zoomed")

MyRoot.mainloop()

Example 2: Tkinter maximise window

root = Tk()
w, h = root.winfo_screenwidth(), root.winfo_screenheight()
root.geometry("%dx%d+0+0" % (w, h))