Why manually change your wallpaper when Python can do it for you? In this project, we’ll write a script that picks a random image from a folder and sets it as your desktop background on Windows.
Note: This tutorial uses the ctypes library to talk to Windows directly. It currently only works on Windows.
Step 1: The Setup
We need os to find files, random to pick one, and ctypes to tell Windows to change the setting.
import ctypes
import os
import random
# Path to your folder of wallpapers (CHANGE THIS!)
WALLPAPER_FOLDER = r"C:\Users\YourName\Pictures\Wallpapers"Step 2: Pick a Random Image
We need to get a list of all valid images in that folder.
def get_random_wallpaper(folder):
# Get all files in the folder
all_files = os.listdir(folder)
# Filter for just images (jpg, png, bmp)
images = [f for f in all_files if f.lower().endswith(('.png', '.jpg', '.jpeg', '.bmp'))]
if not images:
print("No images found in that folder!")
return None
# Pick one at random
random_image = random.choice(images)
# Return the FULL path to the image
return os.path.join(folder, random_image)Step 3: The Magic Command (ctypes)
This is the obscure Windows command that does the actual work. Don’t worry if it looks weird; it’s just standard boilerplate for talking to the Windows API.
def set_wallpaper(image_path):
# SPI_SETDESKWALLPAPER is the code Windows uses for this action
SPI_SETDESKWALLPAPER = 20
# Call the Windows system function
# The '0' and '2' are standard flags for this specific call
ctypes.windll.user32.SystemParametersInfoW(SPI_SETDESKWALLPAPER, 0, image_path, 2)
print(f"Wallpaper changed to: {image_path}")
if __name__ == "__main__":
new_wallpaper = get_random_wallpaper(WALLPAPER_FOLDER)
if new_wallpaper:
set_wallpaper(new_wallpaper)Automation Tip
You can use Windows Task Scheduler to run this script automatically every morning at 9 AM!
