try a search for tkinter geometry for other examples.
good reference is http://infohost.nmt.edu/tcc/help/lang/python/tkinter.pdf
page 15 geometry strings
from tkinter import *
root = Tk()
menu = Menu(root)
root.config(menu=menu)
# try fiddling with these root.geometry values
root.title('My tkinter size experiment')
root.minsize(width=100, height=100)
root.geometry('1000x920+0+0')
subMenu = Menu(menu)
menu.add_cascade(label="File",menu=subMenu)
subMenu.add_command(label="New")
subMenu.add_command(label="Open File...")
subMenu.add_command(label="Close")
subMenu.add_separator()
subMenu.add_command(label="Exit", command=quit)
editMenu = Menu(menu)
menu.add_cascade(label="Edit",menu=editMenu)
editMenu.add_command(label="Undo")
editMenu.add_command(label="Redo")
editMenu = Menu(menu)
menu.add_cascade(label="?",menu=editMenu)
editMenu.add_command(label="Check For Updates")
editMenu.add_command(label="Change log")
editMenu.add_command(label="About")
root.mainloop()
