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Showing content from https://www.geeksforgeeks.org/python/open-a-new-window-with-a-button-in-python-tkinter/ below:

Open a New Window with a Button in Python - Tkinter

Last Updated : 12 Jul, 2025

Tkinter is the most commonly used GUI (Graphical User Interface) library in Python. It is simple, easy to learn and comes built-in with Python. The name "Tkinter" comes from the tk interface, which is the underlying toolkit it uses.

To create multiple windows in a Tkinter application, we use the Toplevel widget. It functions similarly to a Frame, but it opens in a separate window with properties like a title bar, minimize, maximize and close buttons, just like the main application window.

• Toplevel is used to create a new independent window in a Tkinter application.
• It acts like the main window, having its own title bar, minimize, maximize and close buttons.
• It can be used for pop-ups, dialogs or additional windows in the application.

In this guide, we will explore how to open a new window when a button is clicked using two approaches:

1. Using a function to create a new window
2. Using a class-based approach for better modularity

Tkinter comes pre-installed with Python. However, on some Linux distributions like Ubuntu, we may need to install it using: 

sudo apt-get install python-tk 

This approach creates a new window when a button is clicked using the Toplevel widget. Here is the code:

from tkinter import *
from tkinter.ttk import *

# Create the main window
master = Tk()
master.geometry("300x200")  # Set window size
master.title("Main Window")

# Function to open a new window
def open_new_window():
    new_window = Toplevel(master)  # Create a new window
    new_window.title("New Window")
    new_window.geometry("250x150")  

    Label(new_window, text="This is a new window").pack(pady=20)

# Create a label and a button to open the new window
Label(master, text="This is the main window").pack(pady=10)
Button(master, text="Open New Window", command=open_new_window).pack(pady=10)

# Run the Tkinter event loop
master.mainloop()

Output: 

Explanation:

• Toplevel(master): Creates a new window that is independent of the main window.
• new_window.title("New Window"): Sets the window title.
• new_window.geometry("250x150"): Defines the size of the new window.
• Label(...).pack(): Displays text inside the new window.
• command=open_new_window: Calls the function when the button is clicked.

This approach creates a dedicated class for new windows, making the code more reusable and organized. Here is the code:

from tkinter import *
from tkinter.ttk import *

# Class for creating a new window
class NewWindow(Toplevel):
    def __init__(self, master=None):
        super().__init__(master)
        self.title("New Window")
        self.geometry("250x150")

        Label(self, text="This is a new window").pack(pady=20)

# Create the main window
master = Tk()
master.geometry("300x200")
master.title("Main Window")

Label(master, text="This is the main window").pack(pady=10)

# Create a button to open the new window using the class
btn = Button(master, text="Open New Window")
btn.bind("<Button>", lambda e: NewWindow(master))  # Bind the event

btn.pack(pady=10)

# Run the Tkinter event loop
master.mainloop()

Output: 

Explanation:

1. Class-Based Window (NewWindow)

• Inherits from Toplevel, so every instance behaves as a separate window.
• Defines window properties like title, size and a label inside the window.

2. Binding Click Event (bind()): Instead of using command=, we use .bind("<Button>", lambda e: NewWindow(master)), meaning the button click event creates a new window. 

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