import pygame
from pygame import gfxdraw
# Initialise screen
pygame.init()
screen = pygame.display.set_mode((800, 600))
pygame.display.set_caption('pute')

# Event loop
while 1:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            exit(0)
    for x in range(100, 200) :
        for y in range(300, 400) :
            screen.set_at((x, y), (255, 0, 0, 0))
    pygame.display.flip()