Bola que se choca con coche y para python

r = l = u = d = False

x = 50

y = 50

numcoches = 30

xbola = 30

ybola = 30

cars = [] 

def setup():

    size(800, 800)

    frameRate(80)

    

    global cars

    for i in range(numcoches):

        c = color(random(255), random(255), random(255))

        xpos = random(10, width - 10)

        ypos = random(10, height - 10)

        xspeed = random(-5, 5)

        cars.append(Car(c, xpos, ypos, xspeed))

def draw():

    global x, y

    background(0)

    

    ellipse(x, y, xbola, ybola)

    if r:

        x += 1

    if l:

        x -= 1

    if u:

        y -= 1

    if d:

        y += 1

   

    for car in cars:

        car.drive()

        if dist(x, y, car.xpos, car.ypos) < 27:

            noLoop()

        car.display()

def keyPressed():

    global r, l, u, d

    if keyCode == RIGHT:

        r = True

    if keyCode == LEFT:

        l = True

    if keyCode == UP:

        u = True

    if keyCode == DOWN:

        d = True

def keyReleased():

    global r, l, u, d

    if keyCode == RIGHT:

        r = False

    if keyCode == LEFT:

        l = False

    if keyCode == UP:

        u = False

    if keyCode == DOWN:

        d = False

class Car:

    def __init__(self, c, xpos, ypos, xspeed):

        self.c = c

        self.xpos = xpos

        self.ypos = ypos

        self.xspeed = xspeed

    def display(self):

        stroke(0)

        fill(self.c)

        rectMode(CENTER)

        rect(self.xpos, self.ypos, 20, 10)

    def drive(self):

        self.xpos += self.xspeed

        if self.xpos > width:

            self.xpos = 0

        if self.xpos < 0:

            self.xpos = width