(self, number=None)
| 388 | self.__data[-2], self.__data[-1] = self.__data[-1], self.__data[-2] |
| 389 | |
| 390 | def away(self, number=None): |
| 391 | if number is None: |
| 392 | self.__data.pop() |
| 393 | else: |
| 394 | size = len(self.__data) |
| 395 | index = size - number - 1 |
| 396 | assert 0 <= index < size |
| 397 | del self.__data[index:-1] |
| 398 | |
| 399 | # Math Operators |
| 400 |