My whole work consists of manipulating arrays of numbers, mostly in python. I use pandas by default, and treat numpy as a specialised tool to be brought out whe

My whole work consists of manipulating arrays of numbers, mostly in python. I use pandas by default, and treat numpy as a specialised tool to be brought out when the use-case necessitates. Some big things for me are a) timeseries methods that just work e.g. df.resample, b) and multi-indices with stack/unstack etc., c) best I/O of any python data library (e.g. read_csv, read_parquet, read_h5, read_sql, etc)