import pygame 
import sys 
pygame.init()

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

pygame.draw.line(display,(0,0,255),(10,10),(100,100),width = 2)

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