issue_comments: 878837580

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html_url issue_url id node_id user created_at updated_at author_association body reactions performed_via_github_app issue
https://github.com/pydata/xarray/issues/5594#issuecomment-878837580 https://api.github.com/repos/pydata/xarray/issues/5594 878837580 MDEyOklzc3VlQ29tbWVudDg3ODgzNzU4MA== 29140541 2021-07-13T07:11:20Z 2021-07-13T07:11:20Z NONE

For example resample yields the following error:

```python

data.resample(time='1d') Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/home/bruno/miniconda3/envs/torch/lib/python3.8/site-packages/xarray/core/common.py", line 1173, in resample resampler = self._resample_cls( File "/home/bruno/miniconda3/envs/torch/lib/python3.8/site-packages/xarray/core/resample.py", line 175, in init super().init(args, *kwargs) File "/home/bruno/miniconda3/envs/torch/lib/python3.8/site-packages/xarray/core/groupby.py", line 348, in init full_index, first_items = self._get_index_and_items(index, grouper) File "/home/bruno/miniconda3/envs/torch/lib/python3.8/site-packages/xarray/core/groupby.py", line 449, in _get_index_and_items first_items = s.groupby(grouper).first() File "/home/bruno/miniconda3/envs/torch/lib/python3.8/site-packages/pandas/core/series.py", line 1720, in groupby return SeriesGroupBy( File "/home/bruno/miniconda3/envs/torch/lib/python3.8/site-packages/pandas/core/groupby/groupby.py", line 560, in init grouper, exclusions, obj = get_grouper( File "/home/bruno/miniconda3/envs/torch/lib/python3.8/site-packages/pandas/core/groupby/grouper.py", line 719, in get_grouper binner, grouper, obj = key._get_grouper(obj, validate=False) File "/home/bruno/miniconda3/envs/torch/lib/python3.8/site-packages/pandas/core/resample.py", line 1484, in _get_grouper r = self._get_resampler(obj) File "/home/bruno/miniconda3/envs/torch/lib/python3.8/site-packages/pandas/core/resample.py", line 1476, in _get_resampler raise TypeError( TypeError: Only valid with DatetimeIndex, TimedeltaIndex or PeriodIndex, but got an instance of 'Index' ```

 
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