from Tkinter import *

if __name__ == "__main__":
    root = Tk()
    # Absolute positioning
    Button(root, text="Corner").place(x=10, y=10, height=35)
    # Relative positioning
    Button(root, text="Centered").place(relx=0.25, rely=0.25, \
            relwidth=0.5, relheight=0.5)
    root.mainloop()