issue_comments: 594340481

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https://github.com/pydata/xarray/issues/3575#issuecomment-594340481 https://api.github.com/repos/pydata/xarray/issues/3575 594340481 MDEyOklzc3VlQ29tbWVudDU5NDM0MDQ4MQ== 2448579 2020-03-04T05:51:37Z 2020-03-04T05:51:37Z MEMBER

With #3816, this becomes

``` import xarray as xr ds = xr.tutorial.load_dataset('rasm').chunk({'y': 20})

def calculate_anomaly(ds): gb = ds.groupby("time.month") clim = gb.mean(dim='time') return gb - clim

the result looks like ds, so pass that as template

xr.map_blocks(calculate_anomaly, ds, template=ds) ```

@rabernat How does this look to you?

 
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