# Tk_config_widgets.py

# Tk_config_widgets.py

import Tkinter
root = Tkinter.Tk()

msg1 = "Hide Label"
msg2 = "Show Label"

button = Tkinter.Button(root, text=msg1)
button.pack()

label = Tkinter.Label(root, text=">>> Label <<<")

def switch():
    global sw
    sw=(1,0)[sw]
    print sw
    if sw: label.pack(); msg = msg1
    else: label.forget(); msg = msg2
    button.config(text=msg)
    button.pack()
sw = 1
label.pack()

button.config(command=switch)
root.mainloop()