issues: 176403875

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id node_id number title user state locked assignee milestone comments created_at updated_at closed_at author_association active_lock_reason draft pull_request body reactions performed_via_github_app state_reason repo type
176403875 MDU6SXNzdWUxNzY0MDM4NzU= 1002 KeyError when trying to operate on a netCDF file created and read with scipy 8268008 closed 0     1 2016-09-12T15:19:52Z 2016-09-13T02:33:14Z 2016-09-13T02:33:14Z NONE      

This is possibly related to #1001. With the same code and test data, using engine='scipy' in the to_netcdf() and open_dataset() calls,

``` python

import xarray with xarray.open_dataset('snellman.nc', engine='scipy') as dataset: ... print(dataset) ... <xarray.Dataset> Dimensions: (event: 91, faction: 20, game: 2643, round: 7) Coordinates: * game (game) |S32 b'005Stedda' b'006St3dda' b'00s10' b'0106' ... * event (event) |S26 b'action:ACT1' b'action:ACT2' b'action:ACT3' ... * faction (faction) |S14 b'acolytes' b'alchemists' b'auren' ... * round (round) int64 0 1 2 3 4 5 6 Data variables: player5 (game) |S17 b'Stedda' b'Muchacho' b'' b'modong' b'' b'' ... player2 (game) |S21 b'Mies730' b'Stedda' b'romance90' ... date (game) datetime64[ns] 2016-06-07T22:30:47 ... player3 (game) |S19 b'Emoht' b'Xrystofer' b'' b'runrun57' ... player1 (game) |S22 b'ocollard' b'BillyMirmidon' b'00' b'Animax' ... players_count (game) int8 5 5 2 5 3 3 4 4 4 4 4 4 5 5 5 5 5 5 5 3 3 4 2 ... events (game, faction, event, round) float32 nan nan nan nan nan ... player4 (game) |S20 b'Deryl' b'CarpalTunnel' b'' b'Zak_tak' b'' ... scoring_tiles (game, round) |S6 b'' b'SCORE9' b'SCORE4' b'SCORE2' ... ds.mean(dim='round') Traceback (most recent call last): File "<stdin>", line 1, in <module> NameError: name 'ds' is not defined dataset.mean(dim='round') Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/home/user/.local/lib/python3.5/site-packages/xarray/core/common.py", line 41, in wrapped_func **kwargs) File "/home/user/.local/lib/python3.5/site-packages/xarray/core/dataset.py", line 1734, in reduce np.issubdtype(var.dtype, np.number) or File "/home/user/.local/lib/python3.5/site-packages/xarray/core/variable.py", line 244, in dtype return self.data.dtype File "/home/user/.local/lib/python3.5/site-packages/xarray/core/utils.py", line 385, in dtype return self.array.dtype File "/home/user/.local/lib/python3.5/site-packages/xarray/backends/scipy.py", line 46, in dtype return np.dtype(self.array.dtype.kind + str(self.array.dtype.itemsize)) File "/home/user/.local/lib/python3.5/site-packages/xarray/backends/scipy_.py", line 41, in array return self.netcdf_file.variables[self.variable_name].data KeyError: 'events' ```

As in #1001, the same .mean() call doesn't crash if I'm not trying to load it from a file.

This is with xarray (0.8.2) and scipy (0.18.0).

 
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   completed 13221727 issue

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