1. import turtle
2. import random
3. score = 0
4. high_score = 0
5. # Setting the window
6. window = turtle.Screen()
7. window.title("Space War")
8. window.bgcolor("white")
9. window.setup(width=600, height=600)
10. window.tracer(3)
11.  
12. # Player
13. player = turtle.Turtle()
14. player.speed(0)
15. player.shape("triangle")
16. player.color("brown")
17. player.penup()
18. player.goto(0, 0)
19.  
20. #CREATE THE BULLET
21. bullet = turtle.Turtle()
22. bullet.shape("triangle")
23. bullet.penup()
24. bullet.speed(0)
25. bullet.setheading(player.heading())
26. bullet.shapesize(0.2, 0.8)
27. bullet.hideturtle()
28.  
29. bulletspeed = 20
30. bulletstate = "ready"
31.  
32.  
33. # pen
34. Pen = turtle.Turtle()
35. Pen.speed(0)
36. Pen.color("black")
37. Pen.penup()
38. Pen.goto(0, 250)
39. Pen.hideturtle()
40. Pen.clear()
41. Pen.write("Score: {}  High Score: {}".format(score, high_score), align="center", font=("courier", 24, "normal"))
42.  
43. # Foods
44. foods = []
45. # Food
46. for index in range(4):
47.     food = turtle.Turtle()
48.     food.speed(0)
49.     food.shape("circle")
50.     food.color("green")
51.     food.penup()
52.     foods.append(food)
53.     food.setposition(random.randint(-250, 250), random.randint(-250, 250))
54.  
55. # Pen
56. pen = turtle.Turtle()
57. pen.penup()
58. pen.setposition(-280, -280)
59. pen.pendown()
60. pen.pensize(1)
61. for x in range(4):
62.     pen.forward(560)
63.     pen.left(90)
64. pen.hideturtle()
65.  
66. # Variable speed
67. speed = 1
68.  
69.  
70. # Movement function
71. def move_right():
72.     player.right(45)
73.  
74.  
75. def move_left():
76.     player.left(45)
77. def fire_bullet():
78. #DECLARE BULLETSTATE AS GLOBAL IF IT NEEDS CHANGES
79.     global bulletstate
80.     if bulletstate == "ready":
81.         bulletstate = "fire"
82.         #MOVE BULLET TO JUST ABOVE THE PLAYER
83.         x = player.xcor()
84.         y = player.ycor() + 10
85.         bullet.setposition(x, y)
86.         bullet.showturtle()
87.  
88.  
89. def increase_speed():
90.     player.up()
91.     global speed
92.     speed += 1
93.  
94.  
95. def decrease_speed():
96.     player.down()
97.     global speed
98.     speed -= 1
99.  
100.  
101. # Keyboard binding
102. window.listen()
103. window.onkeypress(move_right, "Right")
104. window.onkeypress(move_left, "Left")
105. window.onkeypress(increase_speed, "Up")
106. window.onkeypress(decrease_speed, "Down")
107. window.onkeypress(fire_bullet, "space")
108. # main game loop
109. while True:
110.     window.update()
111.  
112.     # Default player movement
113.     player.forward(speed)
114.  
115.     # player boundary checking
116.     if player.xcor() > 260 or player.xcor() < -260 or player.ycor() > 260 or player.ycor() < -260:
117.         player.right(180)
118.     #MOVE BULLET
119.     if bulletstate == "fire":
120.         y = bullet.ycor()
121.         y += bulletspeed
122.         bullet.sety(y)
123.  
124.  
125.     #CHECK IF BULLET HAS GONE TO TOP
126.     if bullet.ycor() > 275:
127.         bullet.hideturtle()
128.         bulletstate = "ready"
129.  
130.  
131.  
132.     # Move food
133.     for food in foods:
134.         food.forward(1)
135.  
136.         # Foods boundary checking
137.         if food.xcor() > 260 or food.xcor() < -260 or food.ycor() > 260 or food.ycor() < -260:
138.             food.right(180)
139.  
140.         # Check collision between player and food
141.         if food.distance(player) < 20:
142.             x = random.randint(-260, 260)
143.             y = random.randint(-260, 260)
144.             food.goto(x, y)
145.  
146.  
147.  
148.  
149.  
150. window.mainloop()
151.