issue_comments: 556096924

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https://github.com/pydata/xarray/issues/3552#issuecomment-556096924 https://api.github.com/repos/pydata/xarray/issues/3552 556096924 MDEyOklzc3VlQ29tbWVudDU1NjA5NjkyNA== 4179064 2019-11-20T16:53:40Z 2019-11-20T16:53:40Z NONE

I apologize for this slight tangent but it's related to why we use sets in drop(). Is there a good way in xarray to only keep a list of variables? Our approach is to create a set of all variable and subtract from it a set of variables we want to keep and to drop the resulting set of variables we don't want to keep. But it's hard for me to imagine others don't also need this functionality.

 
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