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import Tkinter
import random
def suijishu(a, b):
t.delete(1.0, 'end')
t.insert('end', random.randint(a, b))
t.after(500, suijishu, a, b)
top = Tkinter.Tk()
t = Tkinter.Text(top)
t.pack(expand=1, fill='both')
suijishu(51, 100)
top.mainloop()