pull_requests: 1090510499

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1090510499 PR_kwDOAMm_X85A_96j 7182 open 0 add MultiPandasIndex helper class 4160723 <!-- Feel free to remove check-list items aren't relevant to your change --> - [ ] Closes #xxxx - [ ] Tests added - [ ] User visible changes (including notable bug fixes) are documented in `whats-new.rst` - [ ] New functions/methods are listed in `api.rst` This PR adds a `xarray.indexes.MultiPandasIndex` helper class for building custom, meta-indexes that encapsulate multiple `PandasIndex` instances. Unlike `PandasMultiIndex`, the meta-index classes inheriting from this helper class may encapsulate loosely coupled (pandas) indexes, with coordinates of arbitrary dimensions (each coordinate must be 1-dimensional but an Xarray index may be created from coordinates with differing dimensions). Early prototype in this [notebook](https://notebooksharing.space/view/3d599addf8bd6b06a6acc241453da95e28c61dea4281ecd194fbe8464c9b296f#displayOptions=) TODO / TO FIX: - How to allow custom `__init__` options in subclasses be passed to all the `type(self)(new_indexes)` calls inside the `MultiPandasIndex` "base" class? This could be done via `**kwargs` passed through... However, mypy will certainly complain (Liskov Substitution Principle). - Is `MultiPandasIndex` a good name for this helper class? 2022-10-18T09:42:58Z 2023-08-23T16:30:28Z     6633615eca663c879bba4e9a144050c4aaa7555f     1 e4d753c3bf3ffdc30864510885c68fdb2e8349a2 ab726c536464fbf4d8878041f950d2b0ae09b862 MEMBER   13221727 https://github.com/pydata/xarray/pull/7182  

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