import pygame
from pygame.locals import *
import sys 

pygame.init()
display = pygame.display.set_mode((500,500))
FPS_CLOCK = pygame.time.Clock()

Visible = 1

while 1:
    for event in pygame.event.get():
        if event.type == QUIT:
            pygame.quit()
            sys.exit()
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_a:
                if Visible == 1 :
                    pygame.mouse.set_visible(False)
                    Visible = 0
                    print("Mouse is not visible")
                elif Visible == 0 :
                    pygame.mouse.set_visible(True)
                    Visible = 1
                    print("Mouse is visible")

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