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
1119412984,PR_kwDOAMm_X84x1j9v,6217,Added missing dependency packaging,31591780,closed,0,,,2,2022-01-31T13:13:27Z,2022-01-31T17:10:25Z,2022-01-31T17:10:25Z,NONE,,0,pydata/xarray/pulls/6217,"<!-- Feel free to remove check-list items aren't relevant to your change -->

- [X] Closes #6216
- [ ] Tests added
- [ ] User visible changes (including notable bug fixes) are documented in `whats-new.rst`
- [ ] New functions/methods are listed in `api.rst`
","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/6217/reactions"", ""total_count"": 1, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 1, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,,13221727,pull
1119393852,I_kwDOAMm_X85CuJg8,6216,[Bug]: No module named 'packaging',31591780,closed,0,,,6,2022-01-31T12:56:52Z,2022-01-31T16:47:59Z,2022-01-31T16:47:20Z,NONE,,,,"### What happened?

I installed xarray 0.21.0 in a fresh venv and tried to import, but that raised the following exception:
```
Traceback (most recent call last):
  File ""<string>"", line 1, in <module>
  File ""/tmp/venv/lib/python3.8/site-packages/xarray/__init__.py"", line 1, in <module>
    from . import testing, tutorial, ufuncs
  File ""/tmp/venv/lib/python3.8/site-packages/xarray/testing.py"", line 8, in <module>
    from xarray.core import duck_array_ops, formatting, utils
  File ""/tmp/venv/lib/python3.8/site-packages/xarray/core/duck_array_ops.py"", line 24, in <module>
    from . import dask_array_compat, dask_array_ops, dtypes, npcompat, nputils
  File ""/tmp/venv/lib/python3.8/site-packages/xarray/core/dask_array_compat.py"", line 4, in <module>
    from packaging.version import Version
ModuleNotFoundError: No module named 'packaging'
```

### What did you expect to happen?

That the import would go fine

### Minimal Complete Verifiable Example

```python
python3.8 -m venv /tmp/venv
. /tmp/venv/bin/activate
pip install xarray==0.21.0
python -c ""import xarray""
```
```


### Relevant log output

```python
Traceback (most recent call last):
  File ""<string>"", line 1, in <module>
  File ""/tmp/venv/lib/python3.8/site-packages/xarray/__init__.py"", line 1, in <module>
    from . import testing, tutorial, ufuncs
  File ""/tmp/venv/lib/python3.8/site-packages/xarray/testing.py"", line 8, in <module>
    from xarray.core import duck_array_ops, formatting, utils
  File ""/tmp/venv/lib/python3.8/site-packages/xarray/core/duck_array_ops.py"", line 24, in <module>
    from . import dask_array_compat, dask_array_ops, dtypes, npcompat, nputils
  File ""/tmp/venv/lib/python3.8/site-packages/xarray/core/dask_array_compat.py"", line 4, in <module>
    from packaging.version import Version
ModuleNotFoundError: No module named 'packaging'
```
```


### Anything else we need to know?

_No response_

### Environment

Can't import xarray to generate this output, but relevant versions are
```
python==3.8.5
pip==20.1.1
```","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/6216/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,completed,13221727,issue