Changing windows 10 background to a screenshot without first saving the image

I am writing a program that will take a screenshot of the window in pygame and change the background to that image with ctypes.windll.user32.SystemParametersInfoW. However, saving the image then opening the image to use as the background every frame is slow and I imagine not very good for my computer. Is there a way to take a screen shot E.g. with pygame.image.tostring and use pillow to change the background?

The code so far is:

import pygame, ctypes, random, time

pygame.init()
size = (200,150)
screen = pygame.display.set_mode(size)
path = "C:/Users/theo/image.jpg"
done = False
while not done:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            done = True
    screen.fill((0,0,0))
    pygame.draw.circle(screen, [random.randint(0,255) for i in range(3)], (10,10), 10)
    pygame.display.flip()


    try:
        pygame.image.save(screen, path)
        time.sleep(0.05)
    except:continue
    try:
        ctypes.windll.user32.SystemParametersInfoW(20,0,path,0)
        time.sleep(0.05)
    except:pass
pygame.quit()