Ihre erste Flask-API erstellen

Projektstruktur

flask_api_project/
├── app.py
├── books.py
├── models.py
└── venv/

In-Memory Datenmodell (models.py)

# models.py
books = [
  { 'id': 1, 'title': 'Der Hobbit', 'author': 'J.R.R. Tolkien', 'year': 1937 },
  { 'id': 2, 'title': 'Harry Potter...', 'author': 'J.K. Rowling', 'year': 1997 },
  { 'id': 3, 'title': 'Die Verwandlung', 'author': 'Franz Kafka', 'year': 1915 }
]
next_id = len(books) + 1
# Funktionen: get_all_books(), get_book(), add_book(), update_book(), delete_book()

Flask-Routen – books.py

# Blueprint + Endpoints
@books_bp.route('/api/books', methods=['GET'])      # Alle Bücher
@books_bp.route('/api/books/<int:id>', methods=['GET'])  # Einzelnes Buch
@books_bp.route('/api/books', methods=['POST'])      # Neues Buch
@books_bp.route('/api/books/<int:id>', methods=['PUT'])   # Buch aktualisieren
@books_bp.route('/api/books/<int:id>', methods=['DELETE'])# Buch löschen

Hauptanwendung – app.py

from flask import Flask
from books import books_bp

app = Flask(__name__)
app.register_blueprint(books_bp)

@app.route('/api')
def info():
  return {'name': 'Book API', 'version': '1.0'}

if __name__ == '__main__':
  app.run(debug=True)

API testen (curl)

• curl http://localhost:5000/api/books
• curl -X POST -H "Content-Type: application/json" -d '{"title":"1984","author":"G. Orwell"}' http://localhost:5000/api/books

Gelernt:

• CRUD mit Flask-Blueprints
• HTTP-Methoden & JSON-Antworten
• In-Memory Datenverwaltung
• Fehlerbehandlung mit Statuscodes