import pygame

import sys

pygame.init()

screen = pygame.display.set_mode((400, 400))

while True:

   for event in pygame.event.get():

       if event.type == pygame.QUIT:

           pygame.quit()

           sys.exit()

   screen.fill((255, 255, 255))

   pygame.draw.polygon(screen, (0, 0, 0), [(200, 100), (100, 300), (200, 350)], 1)

   pygame.draw.polygon(screen, (0, 0, 0), [(200, 100), (300, 300), (200, 350)], 1)

   pygame.display.update()