当一只正在移动的 Python 乌龟靠近另一只乌龟时停止它

Question

while当另一只乌龟有 50 个单位时，如何使用循环停止随机移动的乌龟？我有一只乌龟随机选择一个位置并创建一个大点或洞，另一只乌龟随机移动 90 度转弯并每次向前移动 50 个单位。随机移动的乌龟在离开屏幕末端时停止，但是当乌龟到达另一只乌龟创建的洞时，我如何也让乌龟停止？import randomimport turtledef turtlesClose(t1, t2):    if t1.distance(t2)<50:        return True    else:        return Falsedef isInScreen(win,turt):    leftBound = -win.window_width() / 2    rightBound = win.window_width() / 2    topBound = win.window_height() / 2    bottomBound = -win.window_height() / 2    turtleX = turt.xcor()    turtleY = turt.ycor()    stillIn = True    if turtleX > rightBound or turtleX < leftBound:        stillIn = False    if turtleY > topBound or turtleY < bottomBound:        stillIn = False    return stillIndef main():    wn = turtle.Screen()    # Define your turtles here    june = turtle.Turtle()    july = turtle.Turtle()    july.shape('turtle')    july.up()    july.goto(random.randrange(-250, 250, 1), random.randrange(-250, 250, 1))    july.down()    july.dot(100)    june.shape('turtle')    while isInScreen(wn,june):        coin = random.randrange(0, 2)        dist = turtlesClose(july, june)        if coin == 0:            june.left(90)        else:            june.right(90)        june.forward(50)        if dist == 'True':            breakmain()

Answer 1

您的代码的问题是以下语句：

if dist == 'True':

你不想要引号周围True。虽然这会起作用：

if dist == True:

正确的表达方式是：

if dist is True:

或者更好：

if dist:

否则你的代码似乎工作。下面是利用一些海龟习语和其他代码清理的重写：

from random import randrange, choice

from turtle import Screen, Turtle

CURSOR_SIZE = 20

def turtlesClose(t1, t2):

    return t1.distance(t2) < 50

def isInScreen(window, turtle):

    leftBound = -window.window_width() / 2

    rightBound = window.window_width() / 2

    topBound = window.window_height() / 2

    bottomBound = -window.window_height() / 2

    turtleX, turtleY = turtle.position()

    return leftBound < turtleX < rightBound and bottomBound < turtleY < topBound

def main():

    screen = Screen()

    july = Turtle('circle')

    july.shapesize(100 / CURSOR_SIZE)

    july.up()

    july.goto(randrange(-250, 250), randrange(-250, 250))

    july.down()

    june = Turtle('turtle')

    while isInScreen(screen, june):

        if turtlesClose(july, june):

            break

        turn = choice([june.left, june.right])

        turn(90)

        june.forward(50)

main()