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  • Amended docstring to reflect the actual behaviour of Dataset.map · 1 ✖

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  • CONTRIBUTOR · 1 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
1027925460 https://github.com/pydata/xarray/pull/6232#issuecomment-1027925460 https://api.github.com/repos/pydata/xarray/issues/6232 IC_kwDOAMm_X849ROXU lpilz 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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   Amended docstring to reflect the actual behaviour of Dataset.map 1121761078

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