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526578185 https://github.com/pydata/xarray/pull/3250#issuecomment-526578185 https://api.github.com/repos/pydata/xarray/issues/3250 MDEyOklzc3VlQ29tbWVudDUyNjU3ODE4NQ== crusaderky 6213168 2019-08-30T12:13:25Z 2019-08-30T12:13:25Z MEMBER

👍

 
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526334043 https://github.com/pydata/xarray/pull/3250#issuecomment-526334043 https://api.github.com/repos/pydata/xarray/issues/3250 MDEyOklzc3VlQ29tbWVudDUyNjMzNDA0Mw== max-sixty 5635139 2019-08-29T19:47:43Z 2019-08-29T19:47:43Z MEMBER

👍 Thanks @crusaderky 

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526280260 https://github.com/pydata/xarray/pull/3250#issuecomment-526280260 https://api.github.com/repos/pydata/xarray/issues/3250 MDEyOklzc3VlQ29tbWVudDUyNjI4MDI2MA== shoyer 1217238 2019-08-29T17:17:19Z 2019-08-29T17:17:19Z MEMBER

thanks @crusaderky !

 
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526087372 https://github.com/pydata/xarray/pull/3250#issuecomment-526087372 https://api.github.com/repos/pydata/xarray/issues/3250 MDEyOklzc3VlQ29tbWVudDUyNjA4NzM3Mg== crusaderky 6213168 2019-08-29T08:40:57Z 2019-08-29T08:40:57Z MEMBER

Ready for merge if there are no additional comments

 
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525253967 https://github.com/pydata/xarray/pull/3250#issuecomment-525253967 https://api.github.com/repos/pydata/xarray/issues/3250 MDEyOklzc3VlQ29tbWVudDUyNTI1Mzk2Nw== crusaderky 6213168 2019-08-27T11:09:02Z 2019-08-27T11:13:37Z MEMBER

Python 3.7: ```python

In [1]: class A(xarray.DataArray): ...: pass ...:
miniconda3/envs/xarray-py37/bin/ipython:1: FutureWarning: xarray subclass A should explicitly define slots

In [2]: a = A()

In [3]: a.x = 1
miniconda3/envs/xarray-py37/bin/ipython:1: FutureWarning: Setting attribute 'x' on a 'A' object. Explicitly define slots to suppress this warning for legitimate custom attributes and raise an error when attempting variables assignments.

In [4]: a.x
Out[4]: 1

In [5]: a.dict
Out[5]: {'x': 1} ```

Python 3.5: Same, but without the first FutureWarning.

 
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525253062 https://github.com/pydata/xarray/pull/3250#issuecomment-525253062 https://api.github.com/repos/pydata/xarray/issues/3250 MDEyOklzc3VlQ29tbWVudDUyNTI1MzA2Mg== crusaderky 6213168 2019-08-27T11:05:40Z 2019-08-27T11:05:40Z MEMBER

Added automated unit tests for the automated check on __slots__ for all objects inside the xarray library. I could not find a straightforward way to automatically test that objects defined outside of the library log FutureWarning instead - I tested it by hand.

 
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525242799 https://github.com/pydata/xarray/pull/3250#issuecomment-525242799 https://api.github.com/repos/pydata/xarray/issues/3250 MDEyOklzc3VlQ29tbWVudDUyNTI0Mjc5OQ== crusaderky 6213168 2019-08-27T10:32:42Z 2019-08-27T10:32:42Z MEMBER

@shoyer this is theoretically done, however the design I had to come up with to preserve the current statefulness of user-defined accessors displeases me and I'd rather clean it up. See #3268 for design decision.

 
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524456563 https://github.com/pydata/xarray/pull/3250#issuecomment-524456563 https://api.github.com/repos/pydata/xarray/issues/3250 MDEyOklzc3VlQ29tbWVudDUyNDQ1NjU2Mw== shoyer 1217238 2019-08-23T20:45:45Z 2019-08-23T20:45:45Z MEMBER

We definitely do not guarantee implementation details like xarray objects having a dict. A warning for subclasses is already going above and beyond IMO.

On Fri, Aug 23, 2019 at 2:42 PM crusaderky notifications@github.com wrote:

@max-sixty https://github.com/max-sixty any package that for any reason expects xarray objects to have a dict will break overnight. Any package that subclasses from xarray will get a warning.

— You are receiving this because your review was requested. Reply to this email directly, view it on GitHub https://github.com/pydata/xarray/pull/3250?email_source=notifications&email_token=AAJJFVUD2QSIIOF5DHLCGUTQGBDR5A5CNFSM4IO7AUA2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD5BI4IA#issuecomment-524455456, or mute the thread https://github.com/notifications/unsubscribe-auth/AAJJFVUYHG37O2SWYURYRDDQGBDR5ANCNFSM4IO7AUAQ . 

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524455456 https://github.com/pydata/xarray/pull/3250#issuecomment-524455456 https://api.github.com/repos/pydata/xarray/issues/3250 MDEyOklzc3VlQ29tbWVudDUyNDQ1NTQ1Ng== crusaderky 6213168 2019-08-23T20:42:04Z 2019-08-23T20:42:04Z MEMBER

@max-sixty any package that for any reason expects xarray objects to have a __dict__ will break overnight. Any package that subclasses from xarray will get a warning. 

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524327593 https://github.com/pydata/xarray/pull/3250#issuecomment-524327593 https://api.github.com/repos/pydata/xarray/issues/3250 MDEyOklzc3VlQ29tbWVudDUyNDMyNzU5Mw== max-sixty 5635139 2019-08-23T14:03:09Z 2019-08-23T14:03:09Z MEMBER

V interesting!

Is there any downside? IIRC objects don't have a __dict__, so attributes can't be set, which I don't think matters in this case at all? Is there any risk that downstream packages break?

 
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