issue_comments: 603650213

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https://github.com/pydata/xarray/issues/3815#issuecomment-603650213 https://api.github.com/repos/pydata/xarray/issues/3815 603650213 MDEyOklzc3VlQ29tbWVudDYwMzY1MDIxMw== 5635139 2020-03-25T05:36:00Z 2020-03-25T05:36:00Z MEMBER

I had a quick debug but didn't completely resolve it. It works fine if you add it as an attribute; do you mean to be adding a single string as a data variable?

```python

In [8]: import xarray as xr ...: import zarr ...: x = xr.Dataset() ...: x.attrs['hello'] = 'world' # changed ...: x ...: with zarr.ZipStore('test_store.zip', mode='w') as store: ...: x.to_zarr(store) ...: with zarr.ZipStore('test_store.zip', mode='r') as store: ...: x_read = xr.open_zarr(store).compute() ...: ```

Debugging is non-trivial because the ZipFile is closed by the time I could run %debug. It's not impossible but would take more than a quick look in a repl. That said, I do think this looks likely to be a zarr issue given it depends on the storage format that zarr is using. It's possible xarray is calling it incorrectly but I'd think it's less likely.

 
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