import pygame
import sys

pygame.init()

display = pygame.display.set_mode((300, 300))
display.fill((255, 255, 255))

pygame.draw.lines(display, (0, 0, 255), closed=True, points= [(20,20), (60,120), (200, 180)], width=2)

while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()
    pygame.display.update()