issue_comments: 594682466

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https://github.com/pydata/xarray/issues/3829#issuecomment-594682466 https://api.github.com/repos/pydata/xarray/issues/3829 594682466 MDEyOklzc3VlQ29tbWVudDU5NDY4MjQ2Ng== 7441788 2020-03-04T17:27:09Z 2020-03-04T17:27:09Z CONTRIBUTOR

@keewis, thanks for the suggestions. Both seem reasonable.

In your first example, if you wanted to prohibit obj.weighted.sum(dim), you could just check for self._weight in sum(). Though I suppose it would be nice to be able to have the interpreter enforce the requirement and not have to do an explicit check in every method.

 
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