(self)
| 2175 | self._index[colkey] = (colkey, _column) |
| 2176 | |
| 2177 | def _as_readonly(self) -> ReadOnlyColumnCollection[_COLKEY, _COL_co]: |
| 2178 | return ReadOnlyColumnCollection(self) |
| 2179 | |
| 2180 | def as_readonly(self) -> ReadOnlyColumnCollection[_COLKEY, _COL_co]: |
| 2181 | """Return a "read only" form of this |
no test coverage detected