Screen.onkey python

from turtle import Turtle, Screen

screen = Screen()
screen.setup(1200, 500)

# Ground

ground = Turtle()
ground.speed('fastest')

ground.penup()
ground.goto(-1000, -200)
ground.pendown()
ground.forward(2000)

# Player

player = Turtle()
player.speed('fastest')

PlayerX = -600

def moveX():
    global PlayerX

    screen.onkeypress(None, "w")  # disable handler in handler
    player.clear()
    player.penup()
    player.goto(PlayerX, -99)
    player.pendown()
    player.color("Slate Gray")
    player.begin_fill()
    player.circle(-50)
    player.end_fill()

    PlayerX -= 1

    screen.onkeypress(moveX, "w")  # reenable handler

screen.listen()

moveX()

screen.mainloop()  # change import & use turtle.mainloop() if Python 2

Source: stackoverflow.com

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