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  • dhirschfeld · 3 ✖

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  • xr.DataArray.to_series returns a (mutable) view · 3 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
491103705 https://github.com/pydata/xarray/issues/2949#issuecomment-491103705 https://api.github.com/repos/pydata/xarray/issues/2949 MDEyOklzc3VlQ29tbWVudDQ5MTEwMzcwNQ== dhirschfeld 881019 2019-05-09T23:36:37Z 2019-05-09T23:36:37Z NONE

..so you'd need to do: ```python

series = array.to_series().copy(deep=False) series.index = series.index.copy(deep=False) series.index.name = 'shallow_copy' series.index.name 'shallow_copy' array.to_series().index.name 'forward_date' ```

 
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   xr.DataArray.to_series returns a (mutable) view 442063346
491100027 https://github.com/pydata/xarray/issues/2949#issuecomment-491100027 https://api.github.com/repos/pydata/xarray/issues/2949 MDEyOklzc3VlQ29tbWVudDQ5MTEwMDAyNw== dhirschfeld 881019 2019-05-09T23:15:43Z 2019-05-09T23:15:43Z NONE

Unfortunately a shallow copy of a pandas series doesn't shallow copy it's index (I think it should): ```python

series = array.to_series().copy(deep=False) series.index.name = 'shallow_copy' array.to_series().index.name 'shallow_copy' # <--- I'd call this a pandas bug! ```

 
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   xr.DataArray.to_series returns a (mutable) view 442063346
491062218 https://github.com/pydata/xarray/issues/2949#issuecomment-491062218 https://api.github.com/repos/pydata/xarray/issues/2949 MDEyOklzc3VlQ29tbWVudDQ5MTA2MjIxOA== dhirschfeld 881019 2019-05-09T20:53:19Z 2019-05-09T21:00:07Z NONE

Agreed that we definitely don't want to copy the data! I haven't.put in a PR as I think we're a bit hamstrung by pandas' behaviour here so I'm not quite sure how to fix it (without copying the data).

I'm unlikely to get around to a PR in the near term as I'm swamped (and can put up with deep copying the index for now). From my digging about I think the proper fix should be in pandas such that a shallow copy doesn't return a reference to the original name.

 
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   xr.DataArray.to_series returns a (mutable) view 442063346

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