issue_comments: 144133156

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https://github.com/pydata/xarray/issues/593#issuecomment-144133156 https://api.github.com/repos/pydata/xarray/issues/593 144133156 MDEyOklzc3VlQ29tbWVudDE0NDEzMzE1Ng== 1217238 2015-09-29T17:46:04Z 2015-09-29T17:46:04Z MEMBER

My vote would be for catching and re-raising the error with a more informative message. Something like:

``` IndexError: the indexing operation you are attempting to perform is not valid on netCDF4.Variable object. Try loading your data into memory first by calling .load().

Original traceback: ... ```

This is automatic when you re-raise on Python 3. On Python 2, you'll have to use traceback.format_exc() to capture the traceback.

 
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