Add state arguments

ttt_game.py

@@ -45,9 +45,9 @@ class TTTGame:
         we set the reward for X winning to 1 and the reward for O winning to -1.
         All other states (unfinished games and games which ended in a draw) are worth 0.
         """
-        if self.check_winner('X'):
+        if self.check_winner(state, 'X'):
             return 1
-        elif self.check_winner('O'):
+        elif self.check_winner(state, 'O'):
             return -1
         else:
             return 0
@@ -73,7 +73,7 @@ class TTTGame:
         "Checks whether a move is valid"
         return move in self.get_valid_moves()
 
-    def board_is_full(state, self):
+    def board_is_full(self, state):
         "Checks whether all the spaces in the board are occupied."
         for space in state["board"]:
             if space == '-':