Maze Game Part 3

import turtle

wn = turtle.Screen()
wn.bgcolor("black")
wn.title("A Maze Game")
wn.setup(700, 700)

# Create Pen
class Pen(turtle.Turtle):
    def __init__(self):
        turtle.Turtle.__init__(self)
        self.shape("square")
        self.color("white")
        self.penup()
        self.speed(0)


class Player(turtle.Turtle):
    def __init__(self):
        turtle.Turtle.__init__(self)
        self.shape("square")
        self.color("blue")
        self.penup()
        self.speed(0)

    def go_up(self):
        self.goto(self.xcor(), self.ycor() + 24)

    def go_down(self):
        self.goto(self.xcor(), self.ycor() - 24)

    def go_right(self):
        self.goto(self.xcor() + 24, self.ycor())

    def go_left(self):
        self.goto(self.xcor() - 24, self.ycor())

# Create level lists
levels = [""]
# Define first level
level_1 = [
    "XXXXXXXXXXXXXXXXXXXXXXXXX",
    "XP XXXXXXX     XXXXXXX  X",
    "X  XXXXXXX     XXXXXXX  X",
    "X              XXXXXXX  X",
    "X              XXXXXXX  X",
    "XXXXXXXXXXXX  XXX       X",
    "XXXXXXXXXXXX  XXX       X",
    "XXXXXXXXXXXX         XXXX",
    "XXXXXXXXXXXX         XXXX",
    "XX            XXXXX  XXXX",
    "XX            XXXXX  XXXX",
    "XX  XXXXXXXXXXXXXXX  XXXX",
    "XX  XXXXXXXXXXXXXXX  XXXX",
    "XX  XXXXXXXXXXXX        X",
    "XX  XXXXXXXXXXXX        X",
    "XX  XXXXXXXXXXXX  XXXXXXX",
    "X    XXXXXXXXXXX  XXXXXXX",
    "X                 XXXXXXX",
    "X                 XXXXXXX",
    "XXXXXXXXXXXXXXXX  XXXXXXX",
    "XXXXXXXXXXXXX        XXXX",
    "XXXXXXXXXXXXX        XXXX",
    "X                    XXXX",
    "X                    XXXX",
    "XXXXXXXXX    XXXXXXXXXXXX",
    "XXXXXXXXXXXXXXXXXXXXXXXXX"

]
# Add maze to mazes list
levels.append(level_1)

# Create Level Setup Function
def setup_maze(level):
    for y in range(len(level)):
        for x in range(len(level[y])):
            # Get the character at each x,y coordinate
            # NOTE the order of y and x in the next line
            character = level[y][x]
            # Calculate the screen x, y coordinates
            screen_x = -288 + (x * 24)
            screen_y = 288 - (y * 24)

            # Check if it is an X (representing a wall)
            if character == "X":
                pen.goto(screen_x, screen_y)
                pen.stamp()
            # Check if it is a P (representing a player)
            if character == "P":
                player.goto(screen_x, screen_y)

# Create class instances
pen = Pen()
player = Player()
# Set up the level
setup_maze(levels[1])
# Keyboard bindings
wn.onkey(player.go_up, "w")
wn.onkey(player.go_down, "s")
wn.onkey(player.go_right, "d")
wn.onkey(player.go_left, "a")
wn.listen()
# Turn off screen updates
wn.tracer(0)
# Game Main Loop
while True:
    pass