(self, sym)
| 145 | return self.board[i,j] == 0 |
| 146 | |
| 147 | def reward(self, sym): |
| 148 | # no reward until game is over |
| 149 | if not self.game_over(): |
| 150 | return 0 |
| 151 | |
| 152 | # if we get here, game is over |
| 153 | # sym will be self.x or self.o |
| 154 | return 1 if self.winner == sym else 0 |
| 155 | |
| 156 | def get_state(self): |
| 157 | # returns the current state, represented as an int |