Fullscreen Black Screen with Tkinter

This Python script creates a fullscreen, black window using the built-in tkinter library.
It is designed to cover the entire screen and stay on top of all other windows.
The close button (❌) is disabled to prevent the user from closing the window manually.

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🧠 Features

• Launches a borderless fullscreen black window.
• Stays always on top of all other applications.
• Disables the window close button to prevent accidental exit.
• Uses only the standard Python library (no external dependencies).

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🧩 Code Overview

import tkinter 

root = tkinter.Tk()
root.attributes('-fullscreen', True)    # Enable fullscreen
root.attributes('-topmost', True)       # Keep window on top
root.config(bg='black')                 # Set background color to black
root.protocol("WM_DELETE_WINDOW", lambda: None)  # Disable close button
root.mainloop()                         # Run the Tkinter event loop

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🚀 How to Run

1. Make sure you have Python 3.x installed.

2. Save the code to a file, for example:

   fullscreen_black.py
   

3. Run the file from the terminal or command prompt:

   python fullscreen_black.py

4. To exit, you’ll need to use a system shortcut (like Alt + F4 on Windows or Command + Q on macOS).

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⚠️ Why This Code May Not Work Perfectly on macOS

On macOS, Tkinter’s handling of fullscreen and window layering is different from Windows and Linux. The following issues may occur:

• The -fullscreen attribute may not truly hide the menu bar or dock.
• The -topmost attribute is not always respected by macOS’s window manager (the window might go behind other apps).
• The WM_DELETE_WINDOW override can still be bypassed via the macOS “Force Quit” dialog.

✅ What to Do on macOS

To make this work more reliably on macOS:

1. Replace:

   root.attributes('-fullscreen', True)

   with:

   root.attributes('-zoomed', True)

   (This makes the window fill the screen more consistently.)

2. Add the following lines before root.mainloop():

   root.lift()
   root.focus_force()

3. Make sure you’re using Python installed via python.org, not the macOS system Python, as Tkinter behaves inconsistently with the system version.