issue_comments: 673729936

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https://github.com/pydata/xarray/issues/4120#issuecomment-673729936 https://api.github.com/repos/pydata/xarray/issues/4120 673729936 MDEyOklzc3VlQ29tbWVudDY3MzcyOTkzNg== 11411331 2020-08-13T21:56:14Z 2020-08-13T21:56:46Z CONTRIBUTOR

After some testing, I discovered that:

```python

Your code here

import xarray as xr

xr.set_options(keep_attrs=True) # NOTE GLOBAL OPTION!!!!

ds = xr.tutorial.load_dataset("air_temperature") ds2 = xr.tutorial.load_dataset("air_temperature")

xr.testing.assert_identical(ds, ds2) # passes ds.coarsen(lat=5).mean() xr.testing.assert_identical(ds, ds2) # passes ```

makes your example pass. So, it seems that somewhere along the chain of functions the keep_attrs parameter is being lost or modified.

 
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