(self, other)
| 120 | return self.data == set(map(ref, other)) |
| 121 | |
| 122 | def symmetric_difference(self, other): |
| 123 | newset = self.copy() |
| 124 | newset.symmetric_difference_update(other) |
| 125 | return newset |
| 126 | __xor__ = symmetric_difference |
| 127 | |
| 128 | def symmetric_difference_update(self, other): |