Turtle.screen, "onkeypress" ne fonctionne pas

Bonjour,
j'essaie de faire en sorte que lorsque j'appuie sur la barre espace, il m'ajoute 1 au score "space" or cela ne marche pas du tout. Si j'utilise "onclick" par contre là ça marche..

voici le code:

import turtle

setup = turtle.Turtle()
mouse = turtle.Screen()

score = 0

setup.penup()
setup.speed(0)

setup.right(90)
setup.goto(-300, 300)

for a in range(5):
    setup.write("[Upgrade]")
    setup.forward(50)

setup.forward(200)
setup.write(score)



setup.hideturtle()

def whereClick(x, y):
    #print("x=", int(x) ,"/","y=", int(y))

    if -300<=int(x)<=-255 and 300<=int(y)<=312 :
        print("Element 1 upgraded !")

    if -300<=int(x)<=-255 and 250<=int(y)<=262 :
        print("Element 2 upgraded !")

    if -300<=int(x)<=-255 and 200<=int(y)<=212 :
        print("Element 3 upgraded !")

    if -300<=int(x)<=-255 and 150<=int(y)<=162 :
        print("Element 4 upgraded !")

    if -300<=int(x)<=-255 and 100<=int(y)<=112 :
        print("Element 5 upgraded !")

def space():
    global score
    score += 1
    print(score)

mouse.listen
mouse.onclick(whereClick)
mouse.onkeypress(space, "space")

while True:
    mouse.update()

turtle.done()