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/1732#issuecomment-346962014,https://api.github.com/repos/pydata/xarray/issues/1732,346962014,MDEyOklzc3VlQ29tbWVudDM0Njk2MjAxNA==,1217238,2017-11-25T19:49:20Z,2017-11-25T19:49:20Z,MEMBER,Marking this as closed since the issue will be fixed in the next netcdf4-python release. Feel free to submit a PR with a work around for xarray if using the scipy backend is not a good alternative for you.,"{""total_count"": 1, ""+1"": 1, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,275744315
https://github.com/pydata/xarray/issues/1732#issuecomment-346170883,https://api.github.com/repos/pydata/xarray/issues/1732,346170883,MDEyOklzc3VlQ29tbWVudDM0NjE3MDg4Mw==,1217238,2017-11-21T21:43:45Z,2017-11-21T21:43:45Z,MEMBER,"This is pretty clearly a netCDF4-Python bug, which I have reported upstream: https://github.com/Unidata/netcdf4-python/issues/743

If desired, we probably could pretty easily add a work around for this behavior (e.g., to create an empty numpy array of the appropriate shape) to our netCDF4-python wrapper:
https://github.com/pydata/xarray/blob/9d09c1659741dafb1fadeed49c81f9e90a548b07/xarray/backends/netCDF4_.py#L50
","{""total_count"": 2, ""+1"": 2, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,275744315
https://github.com/pydata/xarray/issues/1732#issuecomment-346124602,https://api.github.com/repos/pydata/xarray/issues/1732,346124602,MDEyOklzc3VlQ29tbWVudDM0NjEyNDYwMg==,1217238,2017-11-21T18:51:41Z,2017-11-21T18:51:41Z,MEMBER,This might be specific to string variables (character arrays) and netCDF4. My guess is that netCDF4 may not handle indexing on zero-dimensional arrays properly.,"{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,275744315
https://github.com/pydata/xarray/issues/1732#issuecomment-346116095,https://api.github.com/repos/pydata/xarray/issues/1732,346116095,MDEyOklzc3VlQ29tbWVudDM0NjExNjA5NQ==,6815844,2017-11-21T18:21:03Z,2017-11-21T18:48:20Z,MEMBER,"Reproduced also in my environment.

Selected repr of your dataset is
```python
<xarray.Dataset>
Dimensions:                       (N_CALIB: 1, N_HISTORY: 0, N_LEVELS: 1007, N_PARAM: 3, N_PROF: 33)
Dimensions without coordinates: N_CALIB, N_HISTORY, N_LEVELS, N_PARAM, N_PROF
Data variables:
   ...
    SCIENTIFIC_CALIB_DATE         (N_PROF, N_CALIB, N_PARAM) object b'20150514141619' ...
    HISTORY_INSTITUTION           (N_HISTORY, N_PROF) object ...
```
It seems the data variable in concern, such as `ds['HISTORY_STEP']`, is 2-dimensional but one of the dimensions `N_HISTORY` is size 0.

~~Currently, xarray does not handle such zero-length n-dimensional arrays.
Maybe we need to drop such variables when reading?~~

EDIT: This was wrong. xarray should handle 0-size nd-array.

@shoyer, @fmaussion, any idea?

","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,275744315
https://github.com/pydata/xarray/issues/1732#issuecomment-346123261,https://api.github.com/repos/pydata/xarray/issues/1732,346123261,MDEyOklzc3VlQ29tbWVudDM0NjEyMzI2MQ==,6815844,2017-11-21T18:47:06Z,2017-11-21T18:47:06Z,MEMBER,"I tried with xarray v0.9.6 but it raises the same error. 
Maybe also related to #1719 .","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,275744315
https://github.com/pydata/xarray/issues/1732#issuecomment-346122251,https://api.github.com/repos/pydata/xarray/issues/1732,346122251,MDEyOklzc3VlQ29tbWVudDM0NjEyMjI1MQ==,10050469,2017-11-21T18:43:21Z,2017-11-21T18:43:28Z,MEMBER,"But is this really the issue? Because this works:

```python
import numpy as np
import xarray as xr

a = np.zeros((0, 2))
da = xr.DataArray(a)
da.to_netcdf('test.nc')

xr.open_dataarray('test.nc')
Out[16]: 
<xarray.DataArray (dim_0: 0, dim_1: 2)>
array([], shape=(0, 2), dtype=float64)
Dimensions without coordinates: dim_0, dim_1
```","{""total_count"": 1, ""+1"": 1, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,275744315
https://github.com/pydata/xarray/issues/1732#issuecomment-346120371,https://api.github.com/repos/pydata/xarray/issues/1732,346120371,MDEyOklzc3VlQ29tbWVudDM0NjEyMDM3MQ==,1197350,2017-11-21T18:36:49Z,2017-11-21T18:36:49Z,MEMBER,"> Currently, xarray does not handle such zero-length n-dimensional arrays.
> Maybe we need to drop such variables when reading?

Rather than drop a variable the user could read with no problem under xarray 0.9.6, I propose we examine our new indexing wrappers and figure out how to fix this bug.","{""total_count"": 1, ""+1"": 1, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,275744315
https://github.com/pydata/xarray/issues/1732#issuecomment-346072873,https://api.github.com/repos/pydata/xarray/issues/1732,346072873,MDEyOklzc3VlQ29tbWVudDM0NjA3Mjg3Mw==,1197350,2017-11-21T16:00:58Z,2017-11-21T16:00:58Z,MEMBER,~It's good to see that the release-candidate process actually works!~ 😭 ,"{""total_count"": 1, ""+1"": 0, ""-1"": 0, ""laugh"": 1, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,275744315
https://github.com/pydata/xarray/issues/1732#issuecomment-346059225,https://api.github.com/repos/pydata/xarray/issues/1732,346059225,MDEyOklzc3VlQ29tbWVudDM0NjA1OTIyNQ==,1197350,2017-11-21T15:20:21Z,2017-11-21T15:20:21Z,MEMBER,It's good to see that the release-candidate process actually works! 😉 ,"{""total_count"": 1, ""+1"": 1, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,275744315
https://github.com/pydata/xarray/issues/1732#issuecomment-346056932,https://api.github.com/repos/pydata/xarray/issues/1732,346056932,MDEyOklzc3VlQ29tbWVudDM0NjA1NjkzMg==,2443309,2017-11-21T15:13:45Z,2017-11-21T15:13:45Z,MEMBER,"Yes, please upgrade to 0.10.0 and report back. I cannot reproduce your issue with this release version.","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,275744315
https://github.com/pydata/xarray/issues/1732#issuecomment-346056557,https://api.github.com/repos/pydata/xarray/issues/1732,346056557,MDEyOklzc3VlQ29tbWVudDM0NjA1NjU1Nw==,1197350,2017-11-21T15:12:28Z,2017-11-21T15:12:38Z,MEMBER,"Guillaume--this is very troubling! I use xarray frequently on ARGO netCDF files. It would be a shame if we broke something related to reading them. It sounds like this could be related to the indexing changes in #1676.

Since rc1, xarray 0.10.0 has gone through another release candidate (rc2) and is now in full release. Can you try upgrading to the just-released 0.10.0 and verify whether the problem is still present?
","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,275744315