issue_comments: 625523538

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https://github.com/pydata/xarray/issues/4044#issuecomment-625523538 https://api.github.com/repos/pydata/xarray/issues/4044 625523538 MDEyOklzc3VlQ29tbWVudDYyNTUyMzUzOA== 35968931 2020-05-07T22:13:08Z 2020-05-07T22:13:08Z MEMBER

Hi @seth-p ,

Just to be sure I understand your question, are you asking why concat_dim doesn't default to None in open_mfdataset?

If so, that behaviour is there currently because it's being adapted from a previous, different behaviour, which requires a special placeholder value to give certain backwards-compatible behaviour by default.

But you raise a good point that in future, when combine='nested', the default value of concat_dim should be None, so I've pushed a commit to #3926 to ensure it will, and you should see that behaviour in the next major release.

 
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