CODE EXAMPLE FOR PYTHON

python tkinter messagebox

# We must import messagebox, so we do that
from tkinter import messagebox

#We have 3 options: 
# showinfo - show a dialog with an info icon
# showwarning - show a dialog with a warning icon
# and showerror - show a dialog with a error icon

#every one needs the following inputs:
# title - use a string to make a title for your dialog.
# message - use string to make the message for your dialog

Heres an example using the commands:
showinfo('test info ','test info message')
showwarning('test warning','test warning message')
showerror('test error','test error message')