Tkinter How to Create a Popup Message in Python

Creating the main window: Tk().
Creation of the modal window: Toplevel().


from tkinter import *
from tkinter import ttk
 
def popup():
    info = Toplevel()		  # Popup -> Toplevel()
    info.geometry('200x100')
    info.title('Hello')
    ttk.Button(info, text='Quit', command=info.destroy).pack(padx=10, pady=10)
    info.transient(pack) 	    #Popup reduction impossible
    info.grab_set()	            #Interaction with window impossible game
 
 
pack = Tk()             #Main window -> Tk()
pack.title('Main window')
pack.geometry('300x100')
Button(pack, text='Open popup', command=popup).pack(padx=10, pady=10)
 
pack.mainloop()	    #Only for the main window

from tkinter import *

from tkinter import ttk

def popup():

info = Toplevel() # Popup -> Toplevel()

info.geometry('200x100')

info.title('Hello')

ttk.Button(info, text='Quit', command=info.destroy).pack(padx=10, pady=10)

info.transient(pack) #Popup reduction impossible

info.grab_set() #Interaction with window impossible game

pack = Tk() #Main window -> Tk()

pack.title('Main window')

pack.geometry('300x100')

Button(pack, text='Open popup', command=popup).pack(padx=10, pady=10)

pack.mainloop() #Only for the main window

This code creates a simple Tkinter GUI with a main window and a pop-up window. The main window contains a button that opens the pop-up window when clicked.

The main window is created using the Tk class, and the pop-up window is created using the Toplevel class. The Toplevel class is used to create a window that is independent of the main window, but is still a part of the same application.

The pop-up window contains a button that closes the window when clicked. The transient method is used to make the pop-up window a “transient” window, which means that it will stay on top of the main window and cannot be minimized independently. The grab_set method is used to disable interaction with the main window while the pop-up window is open.

Finally, the mainloop function is called on the main window to start the Tkinter event loop and handle events for the main window.

Warning: only one loop mainloop() corresponding to the main window.

The main_window_name.wait_window (popup window_name) method stops the main script until the popup window is closed.

The pop_popup.grab_set () method prevents any interaction with the main window.