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  • shoyer · 2 ✖

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  • Keep attrs by default? (keep_attrs) · 2 ✖

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id html_url issue_url node_id user created_at updated_at ▲ author_association body reactions performed_via_github_app issue
612522628 https://github.com/pydata/xarray/issues/3891#issuecomment-612522628 https://api.github.com/repos/pydata/xarray/issues/3891 MDEyOklzc3VlQ29tbWVudDYxMjUyMjYyOA== shoyer 1217238 2020-04-11T22:03:56Z 2020-04-11T22:03:56Z MEMBER

I think it would probably be OK to start propagating more attrs by default as a breaking change. There's no easy way to roll this out incrementally, and I doubt too many users are relying upon metadata disappearing when they do xarray operations, given the somewhat inconsistent state of the current rules.

 
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   Keep attrs by default? (keep_attrs) 587895591
604659118 https://github.com/pydata/xarray/issues/3891#issuecomment-604659118 https://api.github.com/repos/pydata/xarray/issues/3891 MDEyOklzc3VlQ29tbWVudDYwNDY1OTExOA== shoyer 1217238 2020-03-26T20:09:59Z 2020-03-26T20:09:59Z MEMBER

See https://github.com/pydata/xarray/issues/1614 for related discussion.

I'm happy to set aside backwards compatibility concerns for now and ponder what the ideal policy would be. The original choices here were not made in a super careful way.

My longest-standing concern here is about units. One common use case for attrs is to mark the units of an array, and those aren't always preserved by naive arithmetic. But perhaps this is less of a concern now that you can use pint with xarray?

The other concern is how to combine attrs in operations that involve multiple arrays. Currently we just copy attrs from the first object, but that probably is not the most consistent (e.g., ideally arithmetic should be reflexive).

 
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   Keep attrs by default? (keep_attrs) 587895591

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