DEPR: 0.21 deprecations master issue
Contemplated deprecations for 0.20.0
- [x] Deprecate `Panel`, #13563 (#15601) (0.20.0)
- [x] Deprecate `.ix`: https://github.com/pydata/pandas/issues/14218 (#15113) (0.20.0)
- [ ] Deprecate `.filter` & `.select` https://github.com/pydata/pandas/issues/12401 (#17633, 0.21.0)
- [ ] Deprecate `.between` https://github.com/pydata/pandas/issues/13027
- [x] Deprecate `.sortlevel` #14279 (#15099) (0.20.0)
- [ ] remove things in #6581 in 0.17.0
- [x] top-level namespace cleanup #13790 (0.20.0)
- [x] `TimeSeries` class (#15098) (0.20.0)
