issue_comments: 437156317

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https://github.com/pydata/xarray/issues/2550#issuecomment-437156317 https://api.github.com/repos/pydata/xarray/issues/2550 437156317 MDEyOklzc3VlQ29tbWVudDQzNzE1NjMxNw== 4806877 2018-11-08T21:07:48Z 2018-11-08T21:07:48Z CONTRIBUTOR

There is a preprocess argument. You provide a function and it is run on every file.

Yes but the input to that function is just the ds, I couldn't figure out a way to get the filename from within a preprocess function. This is what I was doing to poke around in there:

```python def func(ds): import pdb; pdb.set_trace()

xr.open_mfdataset(['./ST4.2018092500.01h', './ST4.2018092501.01h'], engine='pynio', concat_dim='path', preprocess=func) ```

 
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