Sync flask-connexion-rest-part-2 with the updated tutorial

[realpython-bot]

Maintenance update for Python REST APIs With Flask, Connexion, and SQLAlchemy – Part 2.

What changed

requirements.txt bumps the Marshmallow stack, matching the article's updated dependencies field and install command (flask-marshmallow[sqlalchemy]==1.5.0):

• flask-marshmallow 0.14.0 -> 1.5.0
• marshmallow 3.18.0 -> 4.3.1
• marshmallow-sqlalchemy 0.28.1 -> 1.5.0

Why: flask-marshmallow 0.14.0 doesn't cap marshmallow, so a fresh install following the article pulls marshmallow 4.x. That release removed marshmallow.pprint, so from flask_marshmallow import Marshmallow raises ImportError. On Python 3.12+, 0.14.0 also fails because it imports distutils. The other pins stay the same. No code changes were needed.

Verification

• Fresh Python 3.11 venv, pip install -r requirements.txt, built people.db with the README's commands. python app.py served GET / and GET /api/people (200).

• Flask test client: GET /, GET/POST/PUT/DELETE /api/people[/<lname>], the 404 path, and /api/ui/ all returned the expected results.

• ruff@0.14.1 format --check and ruff check both pass.

• Draft update (admin): https://realpython.com/pbjt/blog/post/2422/change/

• Maintenance card: https://trello.com/c/TocAAj4S

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