turtle按键检测示例程序

"""
  turtle按键检测示例程序，程序运行后海龟不断向前移动。
  按空格键暂停或继续移动，按上下左右健改变方向
"""
import turtle

def stop_or_continue():
    global go
    go = not go

go = True
turtle.pensize(5)
turtle.color('red')
turtle.shape('turtle')
turtle.bgcolor('black')
turtle.onkeypress(stop_or_continue,"space")
turtle.onkeypress(lambda:turtle.setheading(90),"Up")
turtle.onkeypress(lambda:turtle.setheading(0),"Right")
turtle.onkeypress(lambda:turtle.setheading(-90),"Down")
turtle.onkeypress(lambda:turtle.setheading(180),"Left")

turtle.listen()

while 1:
    turtle.fd(go*1)
    turtle.update()