issue_comments: 691037092

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https://github.com/pydata/xarray/pull/4409#issuecomment-691037092 https://api.github.com/repos/pydata/xarray/issues/4409 691037092 MDEyOklzc3VlQ29tbWVudDY5MTAzNzA5Mg== 14808389 2020-09-11T11:23:26Z 2020-09-11T14:28:41Z MEMBER

Can you give an example of a non-deterministic coordinate order

sure, just try running python -m pytest --doctest-modules xarray --ignore xarray/tests. For me at least (with the environment created by py38.yml), xarray.core.common.DataWithCoords.pipe, xarray.core.groupby.GroupBy.quantile and xarray.core.dataset.Dataset.filter_by_attrs pass or fail at random: in one run they pass, in the next they fail because a different ordering was used for the coordinates (see also #4408).

I think users find it a little more intuitive to preserve the order of dict keys.

Not sure if that's evidence against this (maybe we need to rearrange the repr to really fix it), but in #4072 someone confused the order of the printed coordinates with the order of the dimensions. I'd think it's much easier to tell people that these are alphabetically sorted, no matter what they do, so they shouldn't try to read the dimension order from the coordinates (same with the dimension summary).

 
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