无论我输入什么参数，速度函数都不会改变海龟的位置

我制作的程序有两只海龟，一只是用户（玩家），另一只是玩家 2，它们通过一个名为 checkcollision 的函数运行，该函数确定海龟是否相交，从而将第二只海龟的 x 和 -250,250 移动到 -250,250 的随机位置y 坐标。然而问题是我希望第二只乌龟（非用户）在屏幕上沿直线移动，我将其设置为 2，并且我也尝试将其设置为正常，这样所有的操作都不会使乌龟移动。

import turtle
import random
wn = turtle.Screen()
wn.setup(width = 450, height = 450)
player = turtle.Turtle()
player2 = turtle.Turtle()

def up():

    y  = player.ycor()
    y = y + 5
    player.sety(y)
    if y>=310:
        player.sety(y-15)
    checkcollision(player,player2)

def down():
    y = player.ycor()
    y = y - 5
    player.sety(y)
    if y<-310:
        player.sety(y+15)
    checkcollision(player,player2)


def left():
    x = player.xcor()
    x = x - 5
    player.setx(x)
    if x<=-625:
        player.setx(x+15)
    checkcollision(player,player2)


def right():
    x = player.xcor()
    x = x + 5
    player.setx(x)
    if x>=625:
        player.setx(x-15)
    checkcollision(player,player2)

player.penup()
player.setpos(0,0)
player.showturtle()
player.shape("square")
wn.bgcolor("green")
player2.shape("turtle")
player2.penup()
player2.setpos(300,300)
player2.showturtle()
player2.setheading(-100)
player2.speed(2)


turtle.listen()
turtle.onkeypress(up,"Up")

turtle.onkeypress(left,"Left")

turtle.onkeypress(right,"Right")

turtle.onkeypress(down, "Down")


def checkcollision(t1,t2):
        if abs(t1.xcor() - t2.xcor()) < 10 and abs(t1.ycor() - t2.ycor()) < 10:
            player2.setpos(random.randint(-250,250), random.randint(-250,250))



checkcollision(player,player2)

您的代码有多个问题，我很惊讶它竟然能按上面所述运行。 （它应该只是落在代码的底部，关闭海龟窗口并返回到控制台。）例如，它似乎不理解它自己的坐标系——x坐标从-425到+425，但是我们正在测试海龟的 x 坐标是否为<= -625。以下是我为解决您的问题和其他问题而进行的修改：

from turtle import Screen, Turtle
from random import randint

def up():
    y = player.ycor() + 5

    if y < 200:
        player.sety(y)
        checkcollision()

def down():
    y = player.ycor() - 5

    if y > -200:
        player.sety(y)
        checkcollision()

def left():
    x = player.xcor() - 5

    if x > -200:
        player.setx(x)
        checkcollision()

def right():
    x = player.xcor() + 5

    if x < 200:
        player.setx(x)
        checkcollision()

def checkcollision():
    if player.distance(player2) < 20:
        player2.setpos(randint(-200, 200), randint(-200, 200))

screen = Screen()
screen.setup(width=450, height=450)
screen.bgcolor('green')

player = Turtle()
player.shape('square')
player.speed('fastest')
player.penup()

player2 = Turtle()
player2.shape('square')
player2.speed('slowest')
player2.color('yellow')
player2.penup()

checkcollision()

screen.onkeypress(up, 'Up')
screen.onkeypress(left, 'Left')
screen.onkeypress(right, 'Right')
screen.onkeypress(down, 'Down')
screen.listen()

screen.mainloop()