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from tkinter import *

root = Tk()
e = Entry(root, width=36)
e.pack()
e.focus_set()
#########
lista = ["bananas", "manzanas"]
a = "Hoy compré %s y %s." % (lista[0], lista[1])
var = IntVar()
#########
e.config(textvariable=var)
var.set(a)

mainloop()