issue_comments: 547613150

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https://github.com/pydata/xarray/issues/3461#issuecomment-547613150 https://api.github.com/repos/pydata/xarray/issues/3461 547613150 MDEyOklzc3VlQ29tbWVudDU0NzYxMzE1MA== 6213168 2019-10-29T20:24:50Z 2019-10-29T20:24:50Z MEMBER

It's a case of improper error message.

I don't think anybody ever thought of passing the axis parameter to any of the Dataset methods before. As a general rule, it would be a very unwise idea unless you're sure that all of your data_vars have the required dimension exactly in the same position.

Note the documentation for Dataset.sum vs. DataArray.sum:

http://xarray.pydata.org/en/stable/generated/xarray.Dataset.sum.html http://xarray.pydata.org/en/stable/generated/xarray.DataArray.sum.html

You were able to pass the axis parameter because Dataset.sum accepts **kwargs, which are intended for backend-specific arguments (e.g. dask's split_every parameter).

The solution is to blacklist a bunch of numpy arguments that don't make sense (axis is one, but out also comes to mind).

 
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