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  • add .dt and .str accessors to DataArray (like pandas.Series) · 2 ✖

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291611335 https://github.com/pydata/xarray/issues/358#issuecomment-291611335 https://api.github.com/repos/pydata/xarray/issues/358 MDEyOklzc3VlQ29tbWVudDI5MTYxMTMzNQ== shoyer 1217238 2017-04-04T19:46:39Z 2017-04-04T20:37:12Z MEMBER

Yes, looks pretty good. It would be nice to consolidate this with xarray's current logic for getting virtual datetime variables (they should probably delegate to the accessor): https://github.com/pydata/xarray/blob/94790388c273c0c1ce2c203940a706d331deb14f/xarray/core/dataset.py#L41

I wonder, is there any way to register such an accessor with DataArrays that have a specific dtype?

The simplest option is to raise AttributeError or TypeError in the constructor, e.g., python @xarray.register_dataarray_accessor('float_only') class FloatOnlyAccessor(object): def __init__(self, parent): if parent.dtype.kind != 'f': raise TypeError('wrong dtype') self.parent = parent

```

xarray.DataArray(1.5).float_only <main.FloatOnlyAccessor at 0x8d51350> xarray.DataArray(1).float_only TypeError: wrong dtype ```

 
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   add .dt and .str accessors to DataArray (like pandas.Series) 59720901
291232960 https://github.com/pydata/xarray/issues/358#issuecomment-291232960 https://api.github.com/repos/pydata/xarray/issues/358 MDEyOklzc3VlQ29tbWVudDI5MTIzMjk2MA== shoyer 1217238 2017-04-03T18:34:47Z 2017-04-03T18:34:47Z MEMBER

Yes, I think this would be quite straightforward. I think the easiest way to do it would simply be to reuse xarray's accessor interface (i.e., register_dataarray_accessor) and then implement all the desired methods/properties.

 
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   add .dt and .str accessors to DataArray (like pandas.Series) 59720901

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