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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
1318992926 I_kwDOAMm_X85Onjwe 6836 groupby(multi-index level) not working correctly on a multi-indexed DataArray or DataSet emmaai 5643062 closed 0 benbovy 4160723   9 2022-07-27T04:06:59Z 2023-06-06T00:21:32Z 2023-06-06T00:21:32Z NONE      

What happened?

run the code block below with 2022.6.0 ``` midx = pd.MultiIndex.from_product([list("abc"), [0, 1]], names=("one", "two"))

mda = xr.DataArray(np.random.rand(6, 3), [("x", midx), ("y", range(3))])

mda.groupby("one").groups output: In [15]: mda.groupby("one").groups Out[15]: {('a', 0): [0], ('a', 1): [1], ('b', 0): [2], ('b', 1): [3], ('c', 0): [4], ('c', 1): [5]} ```

What did you expect to happen?

as it was with 2022.3.0 In [6]: mda.groupby("one").groups Out[6]: {'a': [0, 1], 'b': [2, 3], 'c': [4, 5]}

Minimal Complete Verifiable Example

```Python import pandas as pd import numpy as np import xarray as XR

midx = pd.MultiIndex.from_product([list("abc"), [0, 1]], names=("one", "two"))

mda = xr.DataArray(np.random.rand(6, 3), [("x", midx), ("y", range(3))])

mda.groupby("one").groups ```

MVCE confirmation

  • [X] Minimal example — the example is as focused as reasonably possible to demonstrate the underlying issue in xarray.
  • [X] Complete example — the example is self-contained, including all data and the text of any traceback.
  • [X] Verifiable example — the example copy & pastes into an IPython prompt or Binder notebook, returning the result.
  • [X] New issue — a search of GitHub Issues suggests this is not a duplicate.

Relevant log output

Python N/A

Anything else we need to know?

N/A

Environment

INSTALLED VERSIONS ------------------ commit: None python: 3.8.10 (default, Mar 15 2022, 12:22:08) [GCC 9.4.0] python-bits: 64 OS: Linux OS-release: 5.11.0-1025-aws machine: x86_64 processor: x86_64 byteorder: little LC_ALL: None LANG: C.UTF-8 LOCALE: ('en_US', 'UTF-8') libhdf5: 1.12.0 libnetcdf: 4.7.4 xarray: 2022.6.0 pandas: 1.4.3 numpy: 1.22.4 scipy: 1.7.3 netCDF4: 1.5.8 pydap: None h5netcdf: None h5py: None Nio: None zarr: None cftime: 1.5.1.1 nc_time_axis: None PseudoNetCDF: None rasterio: 1.2.10 cfgrib: None iris: None bottleneck: 1.3.2 dask: 2022.04.1 distributed: 2022.4.1 matplotlib: 3.5.1 cartopy: 0.20.3 seaborn: 0.11.2 numbagg: None fsspec: 2022.01.0 cupy: None pint: None sparse: None flox: None numpy_groupies: None setuptools: 45.2.0 pip: 22.2 conda: None pytest: 7.1.2 IPython: 7.31.0 sphinx: None 
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   completed xarray 13221727 issue

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