issue_comments: 175905067

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https://github.com/pydata/xarray/pull/731#issuecomment-175905067 https://api.github.com/repos/pydata/xarray/issues/731 175905067 MDEyOklzc3VlQ29tbWVudDE3NTkwNTA2Nw== 15167171 2016-01-27T23:07:37Z 2016-01-27T23:07:37Z NONE

It seems in both unsuccesful cases it was trying to import dask and failed, I can't quite figure out what I could have changed to prevent dask from importing:

```

  da = da.chunk()

xarray/test/test_dataarray.py:1618:

xarray/core/dataarray.py:569: in chunk ds = self._to_temp_dataset().chunk(chunks) ```

``` try: from dask.base import tokenize except ImportError:

      import dask  # raise the usual error if dask is entirely missing

E ImportError: No module named 'dask' ```

 
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