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Hold on to your radio variables (an obscure thing, indeed)

from Tkinter  import *       root = Tk()                          def radio1():                       tmp = IntVar()     for i in range(10):          rad = Radiobutton(root, text=str(i), value=i, variable=tmp)         rad.pack(side=LEFT)     tmp.set(5)           radio1() root.mainloop()