Tkinter Messagebox: Displaying Alerts in Python GUIs

import tkinter as tk
my_w = tk.Tk()
from tkinter import messagebox as msg
my_w.geometry("500x500")  # Size of the window 
msg.showinfo("Title Here","Your Message here")
#messagebox.showerror("error","Error")  

my_w.mainloop()  # Keep the window open

tkMessageBox.typeofmessage(title, message [, options]).

showerror

import tkinter as tk
from tkinter import messagebox as msg
my_w = tk.Tk()
my_w.geometry("500x500")  # Size of the window 

msg.showerror("Title Here ","Your Message here ")

my_w.mainloop()

showinfo

#showinfo
import tkinter as tk
from tkinter import messagebox as msg
my_w = tk.Tk()
my_w.geometry("500x500")  # Size of the window 

msg.showinfo("Title Here ","Your info message here ")

my_w.mainloop()

showwarning

import tkinter as tk
from tkinter import messagebox as msg
my_w = tk.Tk()
my_w.geometry("500x500")  # Size of the window 

msg.showwarning("Title Here ","Your warning message here ")

my_w.mainloop()

askokcancel

import tkinter as tk
from tkinter import messagebox as msg
my_w = tk.Tk()
my_w.geometry("500x500")  # Size of the window 

my_var=msg.askokcancel("Title Here ","Your Choice ")
print(my_var) # Output True or False 

my_w.mainloop()

askyesno

import tkinter as tk
from tkinter import messagebox as msg
my_w = tk.Tk()
my_w.geometry("500x500")  # Size of the window 

my_var=msg.askyesno("Title Here ","Your Choice ")
print(my_var) # Output True or False 

my_w.mainloop()

askretrycancel

import tkinter as tk
from tkinter import messagebox as msg
my_w = tk.Tk()
my_w.geometry("500x500")  # Size of the window 

my_var=msg.askretrycancel("Title Here ","Your idea")
print(my_var) # Output True or False 

my_w.mainloop()

askyesnocancel

import tkinter as tk
from tkinter import messagebox as msg
my_w = tk.Tk()
my_w.geometry("500x500")  # Size of the window 

my_var=msg.askyesnocancel("Title Here ","Your choice")
print(my_var) # Output True or False or None

my_w.mainloop()

Default button ( Optional )

import tkinter as tk
from tkinter import messagebox as msg
my_w = tk.Tk()
my_w.geometry("500x500")  # Size of the window 

my_var=msg.askyesnocancel("Title Here ","Your choice",default='cancel')
# default =  yes or no or cancel
print(my_var) 

my_w.mainloop()

icon ( Optional )

import tkinter as tk
from tkinter import messagebox as msg
my_w = tk.Tk()
my_w.geometry("500x500")  # Size of the window 

my_var=msg.askyesnocancel("Title Here ","Your choice",icon='warning')
# icon = warning or error or information or question 
print(my_var) 

my_w.mainloop()

Displaying response in window

import tkinter as tk
from tkinter import messagebox as msg
my_w = tk.Tk()
my_w.geometry("300x200")  # Size of the window 
#my_var=tk.StringVar(my_w)
def show_msg(): # on click of the button b1 
    my_var=msg.askyesnocancel('Title Here', 'Message here')
    print(my_var) # print at console 
    l1.config(text=str(my_var)) # display at Label 

b1=tk.Button(my_w,text='Show Message',command=show_msg)
b1.grid(row=1,column=1,padx=30,pady=30)
my_font=('times',18,'bold')
l1=tk.Label(my_w,text='Output here',font=my_font,bg='yellow')
l1.grid(row=2,column=1)

my_w.mainloop()

l1.config(text=str(my_var)) # display at Label 

Customizing message

def show_msg():
    str1='Alex'
    str2=44
    m1="This is OK Mr {0} \n You R deleting id: {1}".format(str1,str2)
    my_var=msg.askyesnocancel('Title Here', m1)
    print(my_var)
    l1.config(text=str(my_var))

1. Exercise on MessageBox
2. Enter a series of radio button and then show matching messagebox based on the selection and then take input from user and show the value of user selected choice
3. We can set the optional parameters icon to four different values ( info, question, warning, error ) . Create four radio buttons and on click of each button will display one showinfo() messagebox with selected type of icon. Inside the message box you can set the matching title and body message while displaying the different icons.
4. In a message box we can set default selection of button by setting default value. Create three radio buttons which on select will set the value of default selection of buttons. The message box should display matching title and body message while setting the default button