import turtle

show_text = True
def toggle_text():
    global show_text
    show_text = not show_text

def render():
    turtle.ontimer(render, 100)
    turtle.clear()
    turtle.up()

    if show_text:
        turtle.goto(0, -50)
        turtle.write('ABC')
    
    for i in range(10):
        for j in range(10):
            turtle.goto(i * 10, j * 10)
            turtle.begin_fill()
            for _ in range(4):
                turtle.forward(9)
                turtle.right(90)
            turtle.end_fill()
    
    if show_text:
        turtle.goto(0, 100)
        turtle.write('ABC')
    turtle.update()


turtle.tracer(0, 0)
turtle.hideturtle()
turtle.listen()
turtle.onkey(toggle_text, 'space')
render()
turtle.mainloop()