player forward backward movement

constants.py

@@ -6,3 +6,4 @@ ASTEROID_KINDS = 3
 ASTEROID_SPAWN_RATE = 0.8  # seconds
 ASTEROID_MAX_RADIUS = ASTEROID_MIN_RADIUS * ASTEROID_KINDS
 PLAYER_TURN_SPEED = 300
+PLAYER_SPEED = 200

player.py

@@ -1,6 +1,6 @@
 import pygame
 from circleshape import CircleShape
-from constants import PLAYER_RADIUS, PLAYER_TURN_SPEED
+from constants import PLAYER_RADIUS, PLAYER_SPEED, PLAYER_TURN_SPEED
 
 
 class Player(CircleShape):
@@ -32,3 +32,13 @@ class Player(CircleShape):
 
         if keys[pygame.K_d]:
             self.rotate(dt)
+
+        if keys[pygame.K_w]:
+            self.move(dt)
+
+        if keys[pygame.K_s]:
+            self.move(-dt)
+
+    def move(self, dt):
+        forward = pygame.Vector2(0, 1).rotate(self.rotation)
+        self.position += forward * PLAYER_SPEED * dt