Optimized pick-random-elements-from-list method.

robotgame/level_bonus.py

@@ -30,6 +30,7 @@ import random
 import re
 import itertools
 
+import misc
 import level
 import player
 import tile
@@ -52,10 +53,8 @@ class Level(level.Level):
 
         self.draw_background()
 
-        emptys = list(itertools.product(range(2, 20), range(2, 20)))
-        for _ in range(150):
-            x, y = random.choice(emptys)
-            emptys.remove((x, y))
+        for x, y in misc.pick_random_elements(
+            list(itertools.product(range(2, 20), range(2, 20))), 150):
             self.objects.append(block.Block(self, 64 * x, 48 * y,
                                             self.imgs['block1'], movable=True))