issue_comments: 661852012

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https://github.com/pydata/xarray/issues/4236#issuecomment-661852012 https://api.github.com/repos/pydata/xarray/issues/4236 661852012 MDEyOklzc3VlQ29tbWVudDY2MTg1MjAxMg== 35968931 2020-07-21T13:11:00Z 2020-07-21T13:11:00Z MEMBER

I think the actual solution to my problem is to forget about preprocessing.

I'm glad you've found an alternative way to solve your problem!

Still, it's a side-step around the arg passing issue.

So, please tell me if you disagree, but I see it like this: the only time that you would need to be able to pass arguments in to preprocess is if you need to perform an operation within preprocess (i.e. not simply before or after open_mfdataset) that requires a different argument for each file, but when that argument cannot be derived from each file individually.

If you need to pass in global arguments to preprocess, you can use functools.partial to define the preprocess function as having those arguments already set, and if you need only knowledge about the file being currently opened, then that's the use case preprocess is intended for. I can see that there might be other cases where you can't do either of the above, but how often do they actually occur?

 
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