Is there some way to add a global attribute to a netCDF file using xarray? When I do something like hndl_nc['global_attribute'] = 25, it just adds a new variable.
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2 Answers
In Xarray, directly indexing a Dataset like hndl_nc['variable_name'] pulls out a DataArray object. To get or set attributes, index .attrs like hndl_nc.attrs['global_attribute'] or hndl_nc.attrs['global_attribute'] = 25.
You can access both variables and attributes using Python's attribute syntax like hndl_nc.variable_or_attribute_name, but this is a convenience feature that only works when the variable or attribute name does not conflict with a preexisting method or property, and cannot be used for setting.
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I would add here that both Datasets and DataArrays can have attributes, both called with .attrs
e.g.
ds.attrs['global attr'] = 25
ds.variable_2.attrs['variable attr'] = 10
ds.variable_2.attrs['variable attr'] = 10
