issues: 1412901282

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
1412901282 PR_kwDOAMm_X85A_96j 7182 add MultiPandasIndex helper class 4160723 open 0     2 2022-10-18T09:42:58Z 2023-08-23T16:30:28Z   MEMBER   1 pydata/xarray/pulls/7182
  • [ ] 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

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?
 
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