issue_comments: 843824599

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https://github.com/pydata/xarray/issues/5329#issuecomment-843824599 https://api.github.com/repos/pydata/xarray/issues/5329 843824599 MDEyOklzc3VlQ29tbWVudDg0MzgyNDU5OQ== 226037 2021-05-19T07:28:03Z 2021-05-19T07:28:03Z MEMBER

@shoyer and @pont-us my take is that engine=None is mostly and feature to help new users experiment with xarray. The logic for autodetecting the engine has always been extremely fragile and the result depends on what packages are installed on the system.

I think it is OK to add a dedicated xarray.EngineGuessingError, but I'd not try anything more complex and in general invite users to pass engine explicitly.

Examples of strings that identify a dataset when the right backend is installed, but are not paths and the FileNotFoundError would sound confusing: - /vsizip/my.zip/my.tif with rioxarray - https://myhost/myfile.nc with netcdf4 and others

 
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