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from tkinter import *

root = Tk()
e = Entry(root)
e.pack()
e.focus_set()
#########
frutas = ["banana", "manzana", "pera", "limon", "frutilla", "kiwi", "pomelo"]
a = frutas[2]
var = IntVar()
#########
e.config(textvariable=var)
var.set(a)

mainloop()