from turtle import Turtle

import random

COLORS = ["red", "orange", "yellow", "green", "blue", "purple"]

STARTING_MOVE_DISTANCE = 5

MOVE_INCREMENT = 10

DIRECTION = 180

class CarManager:

def __init__(self):

self.cars = []

self.speed = STARTING_MOVE_DISTANCE

def make_car(self):

if random.randint(1, 6) == 1:

new_car = Turtle()

new_car.penup()

new_car.shape('square')

new_car.shapesize(stretch_len=2, stretch_wid=1)

new_car.setheading(DIRECTION)

new_car.color(random.choice(COLORS))

new_car.goto(300, random.randint(-250, 250))

self.cars.append(new_car)

def move_cars(self):

for i in self.cars:

i.forward(self.speed)

def remove_cars(self):

for car in self.cars:

if car.xcor() < -320:

self.cars.remove(car)

def speed_up(self):

self.speed += MOVE_INCREMENT