import sys, pygame
pygame.init()

size = width, height = 320, 240
speed = [2, 2]
black = 0, 0, 0
white = 255,255,255
green = 0,255,0
screen = pygame.display.set_mode(size)





while 1:
for event in pygame.event.get():
if event.type == pygame.QUIT: sys.exit()

screen.fill(white)
pygame.draw.line(screen,green,[0,0],[100,100],5)
y=0
while y < 100:
pygame.draw.line(screen,green,[0,10+y],[100,110+y],5)
y=y+10
pygame.display.flip()