Query params & request data

Your Flask app already exists

Last module you built playground/flask-pawwalk/app.py: a Flask(__name__) app with GET /walkers (a hardcoded WALKERS list) and GET /walkers/<walker_id> (lookup by id, abort(404) if missing). That app is still sitting there. This module extends it — you never start over.

First extension: query parameters. In Part I, URLSession built URLs like /walkers?min_rating=4.8 — the part after ? is the query string. Flask hands it to you through request.args, a dict-like object of everything after the ?.