| 56 | raise NotImplementedError |
| 57 | |
| 58 | class IntegerNodeAlt(NodeAlt): |
| 59 | def __init__(self, value): |
| 60 | self.value = value |
| 61 | |
| 62 | def evaluate(self): |
| 63 | return self.value |
| 64 | |
| 65 | def pretty(self): |
| 66 | return repr(self.value) |
| 67 | |
| 68 | class AddNodeAlt(NodeAlt): |
| 69 | def __init__(self, left, right): |