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  • NowanIlfideme · 1 ✖

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  • How should xarray serialize bytes/unicode strings across Python/netCDF versions? · 1 ✖

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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
730263703 https://github.com/pydata/xarray/issues/2059#issuecomment-730263703 https://api.github.com/repos/pydata/xarray/issues/2059 MDEyOklzc3VlQ29tbWVudDczMDI2MzcwMw== NowanIlfideme 2067093 2020-11-19T10:02:35Z 2020-11-19T10:02:35Z NONE

This may be relevant here, maybe not, but it appears the HDF5 backend is also at odds with all the above serialization.

Our internal project's dependencies changed, and that moved the h5py version from 2.10 to 3.1; apparently there was a breaking change that meant unicode strings were either encoded or decoded as bytes. Thankfully we had a test for that, but figuring out what was wrong was difficult.

Essentially, netCDF4 files that were round-tripped to a BytesIO (via an HDF5 backend) had unicode strings converted to bytes. I'm not sure whether it was the encoding or decoding part, likely decoding, judging by the docs:

https://docs.h5py.org/en/stable/strings.html https://docs.h5py.org/en/stable/whatsnew/3.0.html#breaking-changes-deprecations

This might require even more special-casing to achieve consistent behavior for xarray users who don't really want to go into backend details (like me 😋).

 
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   How should xarray serialize bytes/unicode strings across Python/netCDF versions? 314444743

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