有如下Python代码，执行该代码，说法不正确的是？（ ）

import tkinter as tk

window = tk.Tk()
window.title('ListBox')
window.geometry('300x350')
var1 = tk.StringVar()
label = tk.Label(window, bg='yellow', width=4, height=2, textvariable=var1)
label.pack()

def print_selection():
    value = listbox.get(listbox.curselection())
    var1.set(value)

button = tk.Button(window, text='print selection', command=print_selection)
button.pack()
var2 = tk.StringVar()
var2.set((11, 22, 33, 44))
listbox = tk.Listbox(window, listvariable=var2)
listbox.pack()
listitems = [1, 2, 3, 4]
for item in listitems:
    listbox.insert('end', item)
listbox.insert(1, 'first')
listbox.insert(1, 'second')
listbox.delete(1)
window.mainloop()