GroupBy like API for resample (original) (raw)

Since we wrote resample in xarray, pandas updated resample to have a groupyby-like API (e.g., df.resample('24H').mean() vs. the old df.resample('24H') that uses the mean by default).

It would be nice to redo the xarray resample API to match, e.g., ds.resample(time='24H').mean() vs ds.resample('time', '24H'). This would solve a few use cases, including grouped-resample arithmetic, iterating over groups and (mostly) take care of the need for pd.TimeGrouper support (#364). If we use **kwargs for matching dimension names, this could be done with a minimally painful deprecation cycle.