Alex Kerney

Hi @aaronspring , I definitely understand that you're not up to refactoring it if it's not something you're using day to day. I can't really justify taking on that big...

Hmm, I'm having a hard time pondering through the exact implications or coming up with examples of merging subtrees with more than one level, and what logical results would be,...

IPython looks for [`_ipython_key_completions_()`](https://ipython.readthedocs.io/en/stable/config/integrating.html#tab-completion) for key based access. Xarray already has some support: https://github.com/pydata/xarray/blob/6e77f5e8942206b3e0ab08c3621ade1499d8235b/xarray/core/coordinates.py#L342-L348

I think it would probably be reasonable to limit `..` and `.` to the start of a path, which should limit the set size to the current node and it's...

Continuing from related discussion in https://discourse.pangeo.io/t/xarray-and-collections-of-forecasts/3054/6 It would also be helpful to have it on `.sel` for my usage. I haven't dug around in the guts of datatree enough to...

I wonder if ignoring `KeyError` might be too broad and could catch more than intended (I'm thinking Dask or fsspec `KeyError`s bubbling up). Might be worth exploring getting more tightly...

Would it make sense to make this a sub command? Then there could be another sub command for combining ref json files?

Ya, not sure what that was about. I'll see if I can restart it.

Hmm, all the jobs ended early again. Two again are marked as failed but show canceled, and the rest are canceled. Not sure what's going on with that.

I can run py.test locally and have it pass, but I can't test against the whole matrix while I'm on plane wifi.