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
1434251512,PR_kwDOAMm_X85CHYv0,7252,Use partial function in open_mfdataset example,32146793,closed,0,,,2,2022-11-03T08:00:30Z,2022-11-03T09:18:54Z,2022-11-03T09:18:53Z,CONTRIBUTOR,,0,pydata/xarray/pulls/7252,"The example in `xarray.open_mfdataset` mentions usage of partial function, but does not use it correctly:
(`_preprocess` should not be used as a parameter, but `partial_func` should be used)

```python
partial_func = partial(_preprocess, lon_bnds=lon_bnds, lat_bnds=lat_bnds)
ds = xr.open_mfdataset(
    ""file_*.nc"", concat_dim=""time"", preprocess=_preprocess
) 
```

This PR fixes the example, to use `partial_func`:

```python
partial_func = partial(_preprocess, lon_bnds=lon_bnds, lat_bnds=lat_bnds)
ds = xr.open_mfdataset(
    ""file_*.nc"", concat_dim=""time"", preprocess=partial_func
) 
```



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