Sites per Region

PandasEasyJunior level~10 min

Problem

A logistics company stores its facilities in a DataFrame `warehouses` with columns `region` and `site`.

For each region, combine all of its sites into a single string separated by a comma and a space (', '), with the site names listed in alphabetical order. Return columns `region` and the combined string aliased as `sites`, ordered by `region`.

Input data

Example rows — the live problem includes the full dataset.

warehouses

region	site
North	Aberdeen
North	Carlisle
North	Bradford
South	Brighton
South	Exeter

Expected output

Your answer should return 3 rows with the columns region, sites.

Starter code (Pandas (Python))

import pandas as pd

def sites_per_region(warehouses) -> pd.DataFrame:
    # Your code here
    return warehouses

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