How to close only the TopLevel window in Python Tkinter?

In this article, we will be discussing how to close only the TopLevel window in Python Tkinter.

Syntax:

def exit_btn():

    top.destroy()

    top.update()

btn = Button(top,text=’#Text of the exit button’,command=exit_btn)

Stepwise Implementation

Step 1: First of all, import the library tkinter.

from tkinter import *

Step 2: Now, create a GUI app using tkinter

app=Tk()

Step 3: Next, give a title to the app.

app.title(“#Title you want to assign to app”)

app.geometry(“#Dimensions of the app”)

Step 4: Further, make a function to create a TopLevel window which will be opened when pressed a button on the GUI app.

def top_level():

Step 4.1: In the function, create a TopLevel Window first.

top = Toplevel()

Step 4.2: Moreover, create a title and set the geometry for the TopLevel window.

top.title(“#Title you want to assign to TopLevel window”)

top.geometry(‘#Dimensions of the TopLevel window’)

Step 4.3: Later on, display a message in the TopLevel window.

msg = Message(top, text=”#Text you want to assign to TopLevel window”,width=#Width of the text)

msg.pack()

Step 4.4: Furthermore, make a function for creating an exit button which when clicked will close the TopLevel window.

def exit_btn():
    top.destroy()
    top.update()

Step 4.5: In addition to it, create an exit button for closing the TopLevel window.

btn = Button(top,text=’#Text of the exit button’,command=exit_btn)

btn.pack()

Step 5: Now, declare a button on GUI app, which when clicked will deviate you to the TopLevel window.

Button(app, text=”#Text of the button deviating to TopLevel window”, command=top_level).pack()

Step 6: Finally, make an infinite loop for displaying the app on the screen.

app.mainloop()

Example:

Python3

# Python program to close only the
# TopLevel window in Python Tkinter

# Import the library tkinter
from tkinter import *

# Create a GUI app
app = Tk()

# Set the title and geometry of app
app.title("Main App")
app.geometry('300x100')

# Make a function to create a Top Level window
def top_level():

    # Create a Top Level Window
    top = Toplevel()

    # Create a title and geometry for Top
    # Level Window
    top.title("TopLevel Window")
    top.geometry('200x200')

    # Display a message on Top Level Window
    msg = Message(top, text="Text on TopLevel window", width=150)
    msg.pack()

    # Make a function for exit button
    def exit_btn():
        top.destroy()
        top.update()

    # Create a button to exit Top Level Window
    btn = Button(top, text='EXIT', command=exit_btn)
    btn.pack()

# Create a button to go to Top Level Window
# in GUI app
Button(app, text="Create a TopLevel window", command=top_level).pack()

# Make infinite loop for displaying app on screen
app.mainloop()

Output: