How to use listbox (set item and get selected)

listbox_1.py

import ctypes
import tkinter


def get_selected(event):
    n = listbox.curselection()  #get index no.
    l["text"] = listbox.get(n)  #set label text


if __name__ == "__main__":
    ctypes.windll.shcore.SetProcessDpiAwareness(1)
    root = tkinter.Tk()

    #label
    l = tkinter.Label(
        root,
        text = "select item",
        width = 15,
        bg = "lightblue",
    )
    l.pack()

    #listobox
    item_list = ["Easy", "Normal", "Hard"]
    listbox = tkinter.Listbox(root)
    for item in item_list:
        listbox.insert(tkinter.END, item)
    listbox.bind("<<ListboxSelect>>", get_selected)
    listbox.pack()
    
    root.mainloop()