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()