import pygame
from pygame.locals import *
import sys

pygame.init()
display = pygame.display.set_mode((300,300))
FPS_CLOCK = pygame.time.Clock()


while 1:
    left, middle, right = pygame.mouse.get_pressed()
    if left:
        print("Left mouse key has been pressed")
    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            sys.exit()

    pygame.display.update()
    FPS_CLOCK.tick(30)