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from tkinter import *

root = Tk()
e = Entry(root, width=63)
e.pack()
e.focus_set()
#########
diccionario = {
        'identificador' : 1,
        'nombre'        : 'Leandro',
        'apellido'      : 'Falanga',
        'telefono'      : '1160527111'
        }
a = len(diccionario)
b = list(diccionario.keys())
c = str(a) + " ; " + ", ".join(b)
c = "N° elementos: %s, Claves: %s." % (str(a), ", ".join(b))
var = IntVar()
#########
e.config(textvariable=var)
var.set(c)

mainloop()