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/pull/6232#issuecomment-1027925460,https://api.github.com/repos/pydata/xarray/issues/6232,1027925460,IC_kwDOAMm_X849ROXU,14276158,2022-02-02T13:10:10Z,2022-02-02T13:12:44Z,CONTRIBUTOR,"@mathause You are right in the general case. The function we were working with copied the attributes, but the standard behavior of `map` is to not explicitly add the attributes for dataset and variables.

However, they are also not explicitly deleted after applying `func`, so `func` is able to modify them. So i still feel writing `the new object will be returned without attributes.` is misleading.  I updated my proposed change.

```
import xarray as xr
air = xr.tutorial.open_dataset(""air_temperature"")
def func(da):
    ret = da.copy(data=da.data)
    del ret.attrs['units']
    return ret

assert 'units' not in air.map(func, keep_attrs=False).air.attrs
assert air.map(func, keep_attrs=False).air.attrs != {}
```
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