issue_comments: 368016521

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https://github.com/pydata/xarray/issues/1938#issuecomment-368016521 https://api.github.com/repos/pydata/xarray/issues/1938 368016521 MDEyOklzc3VlQ29tbWVudDM2ODAxNjUyMQ== 2190658 2018-02-23T14:00:50Z 2018-02-23T14:04:18Z MEMBER

Then I would suggest something like the following for hooks (omitting imports):

```python

Registered in order of priority

xarray.interfaces.register('DaskArray', lambda ar: isinstance(ar, da.array)) xarray.hooks.register('nansum', 'DaskArray', da.nansum)

xarray.interfaces.register('SparseArray', lambda ar: isinstance(ar, sparse.SparseArray)) xarray.hooks.register('nansum', 'SparseArray', sparse.nansum) ```

And then, in code, call the appropriate nansum instead of np.nansum:

python nansum = xarray.hooks.get(arr, 'nansum')

If you need help, I'd be willing to give it. :-) But I'm not a user of XArray, so I don't really understand the use-cases or codebase.

 
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