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  • shoyer · 3 ✖
id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
691217305 https://github.com/pydata/xarray/pull/4409#issuecomment-691217305 https://api.github.com/repos/pydata/xarray/issues/4409 MDEyOklzc3VlQ29tbWVudDY5MTIxNzMwNQ== shoyer 1217238 2020-09-11T17:20:06Z 2020-09-11T17:20:06Z MEMBER

One way to fix this is to iterate over variables instead of _coord_names, e.g., instead of: python for k in self._coord_names: ... use: python for k in self._variables: if k in self._coord_names: ...

I believe we already use this trick in a few places for exactly this reason.

 
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   Keep the original ordering of the coordinates 694448177
691181491 https://github.com/pydata/xarray/pull/4409#issuecomment-691181491 https://api.github.com/repos/pydata/xarray/issues/4409 MDEyOklzc3VlQ29tbWVudDY5MTE4MTQ5MQ== shoyer 1217238 2020-09-11T16:03:59Z 2020-09-11T16:03:59Z MEMBER

OK, my guess is that this is happening because there is someplace where we iterate over a Python set (which has a non-deterministic order based on hashing) rather than a Python dict. If we can nail down where that is happening we should remove it!

 
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   Keep the original ordering of the coordinates 694448177
690879736 https://github.com/pydata/xarray/pull/4409#issuecomment-690879736 https://api.github.com/repos/pydata/xarray/issues/4409 MDEyOklzc3VlQ29tbWVudDY5MDg3OTczNg== shoyer 1217238 2020-09-11T05:18:02Z 2020-09-11T05:18:02Z MEMBER

Can you give an example of a non-deterministic coordinate order? That sounds surprising to me, given that on Python 3.6+ dictionaries preserve insertion order.

My preference would be not to sort mappings automatically, either in __init__ or when formatting. I think users find it a little more intuitive to preserve the order of dict keys.

It's true that this is only a guarantee on Python 3.7+, but both CPython 3.6 and all versions of pypy 3 preserve dict insertion order, so in practice we can pretty much always guarantee this. (And soon, Python 3.7 will be required for xarray.)

 
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   Keep the original ordering of the coordinates 694448177

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