import pygame
import time

screen = pygame.display.set_mode((800, 600))

pos = (400, 300)
color = (255,0,0)

pygame.draw.circle(screen, color, pos, 50)
pygame.display.flip()   # Tell pygame we're done writing to the back-buffer --
                        # it can now present this in the window

time.sleep(3)

pygame.display.quit()