Always keep window on bottom in Python for Windows and pygame

pygamebottom.py

# pygame always background
# Emanuele Ruffaldi 2016
import sys, pygame
import win32gui, win32con
import sys, ctypes

class WINDOWPOS(ctypes.Structure):
    _fields_ = [
        ('hwnd', ctypes.c_ulong),
        ('hwndInsertAfter', ctypes.c_ulong),
        ('x', ctypes.c_int),
        ('y', ctypes.c_int),
        ('cx', ctypes.c_int),
        ('cy', ctypes.c_int),
        ('flags', ctypes.c_ulong)
    ]

def mywndproc(oldWndProc, hWnd, msg, wParam, lParam):
    if msg == win32con.WM_WINDOWPOSCHANGING:
        pos = WINDOWPOS.from_address(lParam)
        pos.hwndInsertAfter = win32con.HWND_BOTTOM
    elif msg == win32con.WM_DESTROY:
        win32gui.SetWindowLong(hWnd,win32con.GWL_WNDPROC,oldWndProc)
    return win32gui.CallWindowProc(oldWndProc, hWnd, msg, wParam, lParam)

def main():
    pygame.init()
    size = width, height = 320, 240
    speed = [2, 2]
    black = 0, 0, 0 

    screen = pygame.display.set_mode(size)
    
    info = pygame.display.get_wm_info() #retriving dei dati dell'oggetto display
    HWND = info["window"] #quello che ci serve la voce window.
    win32gui.SetWindowPos(HWND,win32con.HWND_BOTTOM, 0, 0, 0, 0,win32con.SWP_NOMOVE + win32con.SWP_NOSIZE) #comunicazione al sistema operativo della posizione della finestra.

    # super trick to avoid global
    oldWndProc = [None]
    oldWndProc[0] = win32gui.SetWindowLong(HWND,win32con.GWL_WNDPROC,lambda hWnd,msg,wParam,lParam: mywndproc(oldWndProc[0],hWnd,msg,wParam,lParam))

    while 1:
        for event in pygame.event.get():
            if event.type == pygame.QUIT: 
                sys.exit(0)

        screen.fill(black)
        pygame.display.flip()


main()