(self, k: K)
| 165 | self._inv.clear() |
| 166 | |
| 167 | def __delitem__(self, k: K): |
| 168 | |
| 169 | v = self.data.pop(k) |
| 170 | |
| 171 | # if needed in one-many cases |
| 172 | if v in self._inv: |
| 173 | # remove the inverse mapping |
| 174 | inv = self._inv[v] |
| 175 | inv.remove(k) |
| 176 | |
| 177 | # if needed remove the item completely |
| 178 | if not inv: |
| 179 | del self._inv[v] |
| 180 | |
| 181 | |
| 182 | def instance_of(obj: object, *args: object) -> bool: |