Python Framework: Flask

# file name:   main.py
# install:     pip install Flask
# run command: flask --app main run
# host, port:  http://127.0.0.1:5000


from flask import Flask, request

app = Flask(__name__)


# in memory db
BOOKS_DB = [{"book_id": 0, "book_name": "Hi there"},
            {"book_id": 1, "book_name": "How are you?"}]


@app.route('/book')
def show_books():
    count = request.args.get('count')
    count = int(count) if count else None
    return {"books": BOOKS_DB[:count]}


@app.route('/book/<int:book_id>', methods=['GET'])
def show_book(book_id):
    return {book["book_id"]: book for book in BOOKS_DB}[book_id]


@app.post('/book')
def create_book():
    data = request.get_json()
    data["book_id"] = int(len(BOOKS_DB))
    BOOKS_DB.append(data)
    return data