Pack tkinter

from Tkinter import *

root = Tk()

listbox = Listbox(root)
listbox.pack(fill=BOTH, expand=1)

for i in range(20):
    listbox.insert(END, str(i))

mainloop()

Source: effbot.org

TKInter pack()

fred.pack()                     # defaults to side = "top"
fred.pack(side="left")
fred.pack(expand=1)

Source: docs.python.org

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