The tkinter.messagebox
moduleis used to display message boxes in your applications.
Exampe:

from tkinter import messagebox
messagebox.showinfo("Error", "Invalid filtering")
Information message box
tkinter.messagebox.showinfo(title=None, message=None)
Warning message boxes
tkinter.messagebox.showwarning(title=None, message=None)
tkinter.messagebox.showerror(title=None, message=None)
Question message boxes
tkinter.messagebox.askquestion(title=None, message=None)
tkinter.messagebox.askokcancel(title=None, message=None)
return true if the answer is ok.
tkinter.messagebox.askretrycancel(title=None, message=None)
return true if the answer is yes.
tkinter.messagebox.askyesno(title=None, message=None)
return true if the answer is yes.
tkinter.messagebox.askyesnocancel(title=None, message=None)
return true if the answer is yes, None if cancelled.