海龟图形ONKELEASE()

Turtle graphics onkeyrelease()(海龟图形ONKELEASE())

问题描述

无法从Python的Turtle模块实现onkeyrelease()。请指点一下。 错误消息：'module' object has no attribute 'onkeyrelease'。 已尝试用wn.onkeyrelease(stay, 'd')替换turtle.onkeyrelease(stay, 'd')，但无济于事。

import turtle

speed = 0

wn = turtle.Screen()
wn.tracer(0)

box = turtle.Turtle()
box.shape('square')
box.penup()

def move_right():
    global speed
    speed = 2

def stay():
    global speed
    speed = 0

turtle.listen()
turtle.onkey(move_right, 'd')
turtle.onkey(stay, 's')
turtle.onkeyrelease(stay, 'd')

while True:
    wn.update()
    box.setx(box.xcor() + speed)

推荐答案

根据错误消息，我猜测您正在运行的是Python2，而onkeyrelease()是一个Python3方法。即便如此：

是从Python2到Python3转换的产物，onkey()和onkeyrelease()是同义词。您可能需要的是onkeypress()和onkeyrelease()。即便如此：

from turtle import Screen, Turtle, mainloop

speed = 0

def move_faster():
    global speed
    speed = 2

def stay():
    global speed
    speed = 0

def move():
    box.forward(speed)
    screen.update()
    screen.ontimer(move)

screen = Screen()
screen.tracer(False)

box = Turtle()
box.shape('square')
box.penup()

screen.onkey(stay, 's')
screen.onkey(move_faster, 'd')
screen.listen()

move()

mainloop()