checking in

I can't quite get the game to work. It keeps crashing when the
asteroid gets to the bottom.

spaceship.py

@@ -2,3 +2,25 @@
 # ------------
 # By MWC Contributors
 # This module defines a spaceship agent class.
+
+class Spaceship:
+    name = "ship"
+    character = '^'
+
+    def __init__(self,board_size):
+        board_width, board_height = board_size
+        self.position = (board_width // 2, board_height -1)
+
+    def handle_keystroke(self, keystroke, game):
+        x,y = self.position
+        if keystroke.name in ("KEY_LEFT", "KEY_RIGHT"):
+            if keystroke.name == "KEY_LEFT":
+                new_position = (x-1,y)
+            else:
+                new_position = (x+1, y)
+        if game.on_board(new_position):
+            if game.is_empty(new_position):
+                self.position = new_position
+            else:
+                game.end()
+