showwarning python tkinter code example

Example 1: tkinter messagebox

import Tkinter
import tkMessageBox

top = Tkinter.Tk()
def hello():
   tkMessageBox.showinfo("Say Hello", "Hello World")

B1 = Tkinter.Button(top, text = "Say Hello", command = hello)
B1.pack()

top.mainloop()

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)