added target movement, and added dropping.

target.py

@@ -1,21 +1,19 @@
 import pygame
 
 class Target(pygame.sprite.Sprite):
-    def __init__(self, color=(30,0,150), width=16, height=16):
+    def __init__(self, x, y, color=(30,0,150), width=16, height=16):
         super().__init__()
         self.width = width
         self.height = height
         self.image = pygame.Surface((self.width, self.height))
         self.image.fill(color)
         self.rect = self.image.get_rect()
-        self.speed = 4
-        
-    def set_position(self,x,y):
-         self.rect.x, self.rect.y = (x+(self.width/2)),(x+(self.width/2)) # centres co-ordinates
-         
-    def move(self, x,y):
-        if ((self.rect.y + self.width) > window_rect.y) or((self.rect.y - self.width < 0)):
-            movement = self.speed
-        else:
-            movement = -self.speed
-        self.rect.y += movement
+        self.speed = 10
+        self.rect.x, self.rect.y = (x+(self.width/2)),(y+(self.width/2)) # centres co-ordinates
+
+    def move(self):
+        self.rect.x += self.speed
+
+    def drop(self):
+        self.rect.y += 20
+        self.speed *= -1