import pygame, sys
pygame.init()
screen = pygame.display.set_mode([640,480])
screen.fill([255,255,255])
pygame.draw.circle(screen,[255,255,255],[100,100],30,0)
pygame.display.filp()
running = True
while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

pygame.quit()