#Transform

Advanced pandas GroupBy and Window Functions Dataset Setup All examples use a retail sales dataset with transactions across stores, regions, and product categories. import pandas as pd import numpy as np np.random.seed(42) dates = …

pandas groupby() — A Practical Guide What is groupby()? groupby() splits a DataFrame into buckets based on one or more column values, lets you run a function on each bucket independently, then stitches all the results back together into one …