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  • shoyer · 5 ✖

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  • Numpy string coding · 5 ✖

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879529471 https://github.com/pydata/xarray/pull/5264#issuecomment-879529471 https://api.github.com/repos/pydata/xarray/issues/5264 MDEyOklzc3VlQ29tbWVudDg3OTUyOTQ3MQ== shoyer 1217238 2021-07-14T02:08:23Z 2021-07-14T02:08:23Z MEMBER

To add a bit more clarification: the vlen dtype should correspond to an HDF5/netCDF4 compatible data-type, like a variable length string or bytes. np.str_ is just a NumPy variant of str, so the correct dtype is create_vlen_dtype(str).

 
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   Numpy string coding 877016428
879528577 https://github.com/pydata/xarray/pull/5264#issuecomment-879528577 https://api.github.com/repos/pydata/xarray/issues/5264 MDEyOklzc3VlQ29tbWVudDg3OTUyODU3Nw== shoyer 1217238 2021-07-14T02:06:26Z 2021-07-14T02:06:26Z MEMBER

My suggestion is that either _infer_dtype (https://github.com/pydata/xarray/blob/f9a535c130615fe81379d785dffcc6c814fc1126/xarray/conventions.py#L160-L161 ) or the underlying create_vlen_dtype should be updated, so it never puts np.str_ inside a custom vlen dtype. Instead, we should normalize element_type to always be str or bytes inside the vlen dtype.

 
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   Numpy string coding 877016428
848946770 https://github.com/pydata/xarray/pull/5264#issuecomment-848946770 https://api.github.com/repos/pydata/xarray/issues/5264 MDEyOklzc3VlQ29tbWVudDg0ODk0Njc3MA== shoyer 1217238 2021-05-26T16:58:29Z 2021-05-26T16:58:29Z MEMBER

I think the issue must be somewhere around this line, where xarray attempts to infer a dtype for object arrays: https://github.com/pydata/xarray/blob/f9a535c130615fe81379d785dffcc6c814fc1126/xarray/conventions.py#L215

 
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   Numpy string coding 877016428
848522696 https://github.com/pydata/xarray/pull/5264#issuecomment-848522696 https://api.github.com/repos/pydata/xarray/issues/5264 MDEyOklzc3VlQ29tbWVudDg0ODUyMjY5Ng== shoyer 1217238 2021-05-26T07:05:38Z 2021-05-26T07:05:38Z MEMBER

I agree, this should totally work. It's not obvious to me how to best fix it, though.

 
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   Numpy string coding 877016428
833208350 https://github.com/pydata/xarray/pull/5264#issuecomment-833208350 https://api.github.com/repos/pydata/xarray/issues/5264 MDEyOklzc3VlQ29tbWVudDgzMzIwODM1MA== shoyer 1217238 2021-05-06T04:06:04Z 2021-05-06T04:06:04Z MEMBER

So far I've just added a single test which fails. I don't think the test should fail although I'm not sure what the np.str_ type actually is so maybe this isn't a bug? Help/advice greatly appreciated.

What problem are you trying to solve here?

This vlen string stuff is an internal API that isn't really intended for use outside Xarray.

 
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   Numpy string coding 877016428

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