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  • Surprising deepcopy semantics with dtype='object' · 3 ✖

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679869467 https://github.com/pydata/xarray/issues/4362#issuecomment-679869467 https://api.github.com/repos/pydata/xarray/issues/4362 MDEyOklzc3VlQ29tbWVudDY3OTg2OTQ2Nw== mathause 10194086 2020-08-25T08:00:21Z 2020-08-25T08:00:21Z MEMBER

@darikg are you interested to send in a PR? 

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   Surprising deepcopy semantics with dtype='object' 683649612
678811192 https://github.com/pydata/xarray/issues/4362#issuecomment-678811192 https://api.github.com/repos/pydata/xarray/issues/4362 MDEyOklzc3VlQ29tbWVudDY3ODgxMTE5Mg== shoyer 1217238 2020-08-23T18:58:13Z 2020-08-23T18:58:13Z MEMBER

I agree, marking this as a bug. We should use deepcopy() recursively on NumPy arrays.

 
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   Surprising deepcopy semantics with dtype='object' 683649612
678369025 https://github.com/pydata/xarray/issues/4362#issuecomment-678369025 https://api.github.com/repos/pydata/xarray/issues/4362 MDEyOklzc3VlQ29tbWVudDY3ODM2OTAyNQ== keewis 14808389 2020-08-21T16:05:46Z 2020-08-21T16:05:46Z MEMBER

the issue is that we use numpy.ndarray.copy to copy the data: https://github.com/pydata/xarray/blob/43a2a4bdf3a492d89aae9f2c5b0867932ff51cef/xarray/core/variable.py#L939 (numpy.ndarray defines __array_function__).

You can reproduce the issue using just numpy: python In [14]: a0.copy()[0] is a0[0] Out[14]: True

We might want to use deepcopy instead because duck arrays are not required to implement .copy.

 
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   Surprising deepcopy semantics with dtype='object' 683649612

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