issue_comments: 681188808

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https://github.com/pydata/xarray/pull/4221#issuecomment-681188808 https://api.github.com/repos/pydata/xarray/issues/4221 681188808 MDEyOklzc3VlQ29tbWVudDY4MTE4ODgwOA== 14808389 2020-08-27T00:17:12Z 2020-08-27T00:23:49Z MEMBER

yes, the failing test is definitely due to NEP18: there's a numpy array in an attribute, but since numpy 1.15 doesn't define __array_function__, is_duck_array returns False. We could extend is_duck_array with an isinstance check for numpy.ndarray, or we could take your suggestion and xfail the test. Not sure which is better.

black recently released a new version, which changed the way it treats a trailing comma, and it also reformats docstrings (at least as much as it can without breaking formats), but neither conda nor the pre-commit hook install the new version (yet). To make the diff of this PR as small as possible, I'm opening a new PR with just the automatic changes, once that is merged, it should be fixed by merging in master.

Edit: see #4381

 
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