How to use combobox-1

combobox.py

import ctypes
import tkinter
from tkinter import ttk


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

    root = tkinter.Tk()
    var = tkinter.StringVar(root)   #variable

    #label
    l = tkinter.Label(
            root,
            bg = "cyan",
            width = 15,
            textvariable = var,
        )
    l.pack()

    #combobox
    item_list = ["Easy", "Normal", "Hard"]
    combobox = ttk.Combobox(
        root,
        values = item_list, #set item_list
        textvariable = var,
    )
    combobox.pack()
    
    root.mainloop()