issue_comments: 335518624

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https://github.com/pydata/xarray/pull/1609#issuecomment-335518624 https://api.github.com/repos/pydata/xarray/issues/1609 335518624 MDEyOklzc3VlQ29tbWVudDMzNTUxODYyNA== 2443309 2017-10-10T15:50:09Z 2017-10-10T15:50:09Z MEMBER

@fmaussion - you bring up a good point. There are two scenarios here.

1) appending to a file with existing data variables 2) appending to a file with existing coordinate variables

I'm wondering if we should disallow 1, in favor of being more explicit. So:

```Python list_of_vars_to_append = ['var1', 'var2'] ds[list_of_vars_to_append].to_netcdf(filename, mode='a')

if either var1 or var2 are in filename, raise an error?

`` as apposed to the current behavior which would silently skip all vars already infilenameand not inlist_of_vars_to_append`.

 
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