from Tkinter import *
class App:
def __init__(self, master):
master.geometry("300x200")
fm = Frame(master)
Button(fm, text='Left').pack(side=LEFT, fill=X, expand=NO)
Button(fm, text='Center').pack(side=LEFT, fill=X, expand=NO)
Button(fm, text='Right').pack(side=LEFT, fill=X, expand=YES)
fm.pack(fill=BOTH, expand=YES)
root = Tk()
root.option_add('*font', ('verdana', 12, 'bold'))
root.title("Pack - Example 8")
display = App(root)
root.mainloop()
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