'How to insert items to a tkinter listbox from a grib file without duplicates?

I'm trying to insert items to a tkinter listbox from a grib file using keywords like name or forecastTime, but I don't want the listbox to contain duplicates just one of each value. Couldn't get it to work using lists and ifs only work for specific files and I want it to be operational with any grib I attach to it. Here's the code:

from tkinter import *
import pygrib

okno = Tk()

grbs = pygrib.open('/home/michal/Desktop/ROUTING_subarea_1_wind_wave.grb2')

listaprognoza = Listbox(okno, height=8, width=50, exportselection=False)
listaprognoza.pack()

grbs.seek(0)
for grb in grbs:
    listaprognoza.insert(END, grb.name)

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'How to insert items to a tkinter listbox from a grib file without duplicates?

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