issue_comments: 832239085
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| html_url | issue_url | id | node_id | user | created_at | updated_at | author_association | body | reactions | performed_via_github_app | issue |
|---|---|---|---|---|---|---|---|---|---|---|---|
| https://github.com/pydata/xarray/issues/5254#issuecomment-832239085 | https://api.github.com/repos/pydata/xarray/issues/5254 | 832239085 | MDEyOklzc3VlQ29tbWVudDgzMjIzOTA4NQ== | 10194086 | 2021-05-04T20:55:19Z | 2021-05-04T20:55:19Z | MEMBER | For completeness, here is the error of the second case:
```python-traceback
TypeError Traceback (most recent call last)
<ipython-input-5-41afac9c294c> in <module>
1 data = xr.Dataset()
2 data.attrs['bool_type'] = np.True_
----> 3 data.to_netcdf()
~/code/xarray/xarray/core/dataset.py in to_netcdf(self, path, mode, format, group, engine, encoding, unlimited_dims, compute, invalid_netcdf)
1782 from ..backends.api import to_netcdf
1783
-> 1784 return to_netcdf(
1785 self,
1786 path,
~/code/xarray/xarray/backends/api.py in to_netcdf(dataset, path_or_file, mode, format, group, engine, encoding, unlimited_dims, compute, multifile, invalid_netcdf)
1033 # validate Dataset keys, DataArray names, and attr keys/values
1034 _validate_dataset_names(dataset)
-> 1035 _validate_attrs(dataset, invalid_netcdf=invalid_netcdf and engine == "h5netcdf")
1036
1037 try:
~/code/xarray/xarray/backends/api.py in _validate_attrs(dataset, invalid_netcdf)
170 # Check attrs on the dataset itself
171 for k, v in dataset.attrs.items():
--> 172 check_attr(k, v, valid_types)
173
174 # Check attrs on each variable within the dataset
~/code/xarray/xarray/backends/api.py in check_attr(name, value, valid_types)
162
163 if not isinstance(value, valid_types):
--> 164 raise TypeError(
165 f"Invalid value for attr {name!r}: {value!r}. For serialization to "
166 "netCDF files, its value must be of one of the following types: "
TypeError: Invalid value for attr 'bool_type': True. For serialization to netCDF files, its value must be of one of the following types: str, Number, ndarray, number, list, tuple
```
Can you give some more details. The only way I managed to see the round-trip effect you describe is using |
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