how to create a messagebox in tkinter code example

Example 1: python tkinter messagebox

import tkinter
from tkinter import messagebox
# hide main window
root = tkinter.Tk()
# message box display
messagebox.showerror("Error", "Error message")
messagebox.showwarning("Warning","Warning message")
messagebox.showinfo("Information","Informative message")

Example 2: list in tkinter messagebox

from tkinter import *
from tkinter import messagebox

def listMessageBox(arr):
  window=Tk()
  listbox=Listbox(window)
  listbox.pack(fill=BOTH, expand=1) #adds listbox to window
  [listbox.insert(END, row) for row in arr] #one line for loop
  window.mainloop()
  
arr=['a','b','c','1','2','3']

listMessageBox(arr)