space invader with score storage

#Space Invaders
#Sound (Mac0SX Only)
from turtle import *
import math
import random

lstEmail = list()
lst = list()
idCount = 0
bulletstate = "ready"
class game:
    def __init__(self,name,score):
        self.name = name
        self.score = score
        self.record_name = []
        self.record_score = []
    def main(self):

        xit = True
        while xit is True:
            print("\nWelcome to SPACE GUARDIAN")
            print("Press 1 to Play\nPress 2 to Highscore\nPress 3 to Save the Game\n")


            choice = input("\nEnter Choice: ")
            if choice == "1":
                print("\n")
                ui.Game()
            elif choice == "2":
                print("\n")
                ui.rank()
            elif choice == "3":
                print("\n")
                ui.record("")
            elif choice == "4":
                print("\nThanks for playing!")
                xit = False
    def record(self,name):
        self.name = input("Enter Username: ")

        print("Name: %s"%self.name)
        print("Score: %d"%self.score)
        self.record_name.append(self.name)
        self.record_score.append(self.score)
        self.score = 0
        ui.main()
    def rank(self):
        print("~~~ H I G H  S C O R E ~~~")
        for i in range(len(self.record_name)):
            print("Name: " + self.record_name[i])
            print("Score: %d"  %self.record_score[i])
            print("\n")
        ui.main()


    bulletstate = "ready"

    def Game(self):

    #Set up screen
            wn = Screen()
            wn.bgcolor("black")
            wn.title("Space Invaders")
            wn.bgpic("space_invaders_background.gif")

            #Register shapes
            wn.addshape("invader.gif")
            wn.addshape("player (2).gif")
            wn.addshape("knife.gif")

            numofenemies =5
            enemies =[]
            print("-- 1 Easy\n-- 2 Medium\n-- 3 Hard\n ")
            cha = input("Enter Choice: ")
            if cha =="1":
                for i in range(10):
                    enemies.append(Turtle())
                    enemyspeed = 10
            elif cha =="2":
                for i in range(30):
                    enemies.append(Turtle())
                    enemyspeed = 15
            elif cha =="3":
                for i in range(50):
                    enemies.append(Turtle())
                    enemyspeed = 15
            #Draw border
            borderpen = Turtle()
            borderpen.speed(0)
            borderpen.color("white")
            borderpen.penup()
            borderpen.setposition(-300,-300)
            borderpen.pendown()
            borderpen.pensize(5)
            for side in range(4):
                    borderpen.fd(600)
                    borderpen.lt(90)
            borderpen.hideturtle()

            self.score= 0

            #display score
            scorepen = Turtle()
            scorepen.speed(0)
            scorepen.color("white")
            scorepen.penup()
            scorepen.setposition(-290,280)
            scorestring = "Score: %d" %self.score
            scorepen.write(scorestring,False,align="Left",font=("Arial", 14, "normal"))
            scorepen.hideturtle()

            #Create player
            player = Turtle()
            player.color("blue")
            player.shape("player (2).gif")
            player.penup()
            player.speed(0)
            player.setposition(0, -250)
            player.setheading(90)

            playerspeed = 25


            #Add enemies to list


            for goal in enemies:
                goal.shape("invader.gif")
                goal.penup()
                goal.speed(0)
                x = random.randint(-200,200)
                y = random.randint(100,250)
                goal.setposition(x,y)



            #Bullet
            bullet = Turtle()
            bullet.color("yellow")
            bullet.shape("circle")
            bullet.penup()
            bullet.speed(0)
            bullet.setheading(90)
            bullet.shapesize(0.5,0.5)
            bullet.hideturtle()

            bulletspeed = 90

            #bulletstate
            #ready = to fire
            #fire = firing
            bulletstate = "ready"
            #Move player left to right
            def moveleft():
                    x = player.xcor()
                    x -= playerspeed
                    if x < -280:
                            x = - 280
                    player.setx(x)
            def moveright():
                    x = player.xcor()
                    x += playerspeed
                    if x > 280:
                            x = 280
                    player.setx(x)

            def firebullet():
                    #global bulletstate
                    bulletstate = "ready"
                    if bulletstate == "ready":
                            bulletstate = "fire"
                            #move bullet upward
                            x =player.xcor()
                            y= player.ycor()+10
                            bullet.setposition(x,y)
                            bullet.showturtle()
            def isCollision(t1,t2):
                    distance = math.sqrt(math.pow(t1.xcor()-t2.xcor(),2)+ math.pow(t1.ycor()-t2.ycor(),2))
                    if distance <15:
                            return True
                    else:
                            return False

            #Keyboard bindings
            wn.listen()
            wn.onkey(moveleft, "Left")
            wn.onkey(moveright, "Right")
            wn.onkey(firebullet, "space")

            #game loop
            while True:

                    for enemy in enemies:
                            #move enemy
                            x= enemy.xcor()
                            x += enemyspeed
                            enemy.setx(x)
                            #Boundary check
                            if enemy.xcor() > 300 or enemy.xcor() < -300:
                                print("GAME OVER")
                                t1 = Pen()
                                t1.pencolor("red")
                                t1.hideturtle()
                                t1.penup()
                                t1.write("GAME OVER", align = "center", font=("Verdana", 45, "bold"))
                                t1.setposition(0,-350)
                                t1.penup()


                            if enemy.ycor() > 300 or enemy.ycor() < -300:
                                print("Game OVER")
                                t1 = Pen()
                                t1.pencolor("red")
                                t1.hideturtle()
                                t1.penup()
                                t1.write("GAME OVER", align = "center", font=("Verdana", 45, "bold"))
                                t1.setposition(0,-350)
                                t1.penup()
                                ui.repeat()

                            #Move enemy back and down
                            if enemy.xcor() > 280:
                                    #enemy down
                                    for e in enemies:
                                            y = e.ycor()
                                            y -= 40
                                            e.sety(y)
                                    #change direction
                                    enemyspeed *= -1
                            if enemy.xcor() < - 280:
                                    #enemy down
                                    for e in enemies:
                                            y = e.ycor()
                                            y -= 40
                                            e.sety(y)
                                    #change direction
                                    enemyspeed *= -1
                            #check collision between bullet and enemy
                            if isCollision(bullet, enemy):
                                    #reset bullet
                                    bullet.hideturtle()
                                    bulletstate = "ready"
                                    bullet.setposition(0,-400)
                                    #reset enemy
                                    x = random.randint(-200,200)
                                    y = random.randint(100,250)
                                    enemy.setposition(x,y)

                                    #Update
                                    self.score += 10
                                    scorestring = "Score: %d" %self.score
                                    scorepen.clear()
                                    scorepen.write(scorestring, False, align="left", font=("Arial", 14, "normal"))
                                    print("Your score is", self.score)

                                    #lst.append(Inorder)
                            if isCollision(player,enemy):
                                    player.hideturtle()
                                    enemy.hideturtle()
                                    pen=Turtle()
                                    pen.hideturtle()
                                    pen.speed(0)
                                    pen.color("red")
                                    pen.penup()
                                    pen.goto(-200,0)
                                    pen.write("GAME OVER",  font = ("Verdana 45 bold"))
                                    pen.clear()
                                    ui.repeat()


                    # move bullet
                    if bulletstate == "fire":
                            y = bullet.ycor()
                            y += bulletspeed
                            bullet.sety(y)

                    #Check bullet disapperance
                    if bullet.ycor() > 275:
                            bullet.hideturtle()
                            bulletstate = "ready"


            delay = raw_input("Press enter to finish")


    def repeat(self):
        again = input("\n WANNA PLAY AGAIN\nY - YES\nN - NO\n")
        if again == 'Y':

            ui.main()

        elif again == 'N':
          quit()



ui = game("User", 0)
ui.main()