tkinter| listbox.insert problem

[Yoriz]

Just like in the print_me function where you get the value corresponding to the given index, you need to do that in the function add_me
Change

def add_me():
    selected_items = listbox.curselection()
    for item in selected_items:
        listbox.insert(END, item)
        print(item, 'is added')

to

def add_me():
    selected_items = listbox.curselection()
    for item in selected_items:
        item_value = listbox.get(item)
        listbox.insert(END, item_value)
        print(item_value, 'is added')