Python Game

game.py

import turtle

# set up screen
window = turtle.Screen()
window.bgcolor("#bbb")

# Setting up boundry
mypen = turtle.Turtle()
mypen.penup()
mypen.setposition(-260, -260)
mypen.pendown()
mypen.speed(5)
mypen.shapesize(1)
mypen.pensize(4)
mypen.hideturtle()

# moving boundry
for i in range(4):
    mypen.forward(520)
    mypen.left(90)

# creating a player
player = turtle.Turtle()
player.shapesize(1)
player.color("red")
player.shape("triangle")
player.speed(0)
player.penup()


def turn_right():
    player.right(30)


def turn_left():
    player.left(30)


def increase_speed():
    global speed
    speed += 1


def decrease_speed():
    global speed
    speed -= 1

# keyboard binding
turtle.listen()
turtle.onkey(turn_left, "Left")
turtle.onkey(turn_right, "Right")
turtle.onkey(increase_speed, "Up")
turtle.onkey(decrease_speed, "Down")

# setting up the speed for turtle
speed = 1
while True:
    player.forward(speed)
    if player.xcor() < -245 or player.xcor() > 245:
        player.right(180)

    if player.ycor() < -245 or player.ycor() > 245:
        player.right(180)