my simple tkinter Listbox GUI

simple_tklb.py

def simple_tklb(fn_get_list, fn_double_click_item):
    from tkinter import Tk, Listbox

    tk = Tk()
    lb = Listbox(tk)

    for idx, item in enumerate(fn_get_list()):
        lb.insert(idx, item)

    def onselect(event):
        if fn_double_click_item:
            w = event.widget
            index = int(w.curselection()[0])
            value = w.get(index)
            fn_double_click_item(index, value)
    lb.bind('<Double-1>', onselect)

    lb.config(width=0, height=0)
    lb.pack()
    tk.mainloop()

if __name__ == '__main__':
    def fn_get_list():
        return ('aaaaaaaaaa', 'bbbbbbbb', 'cccccccc')

    def fn_double_click_item(idx, item):
        print(f'idx: {idx}; item: {item}')

    simple_tklb(fn_get_list, fn_double_click_item)