Flask CRUD demo

client.py

import requests


r = requests.get('http://127.0.0.1:5000/ai-quotes')

print(r.status_code)
print(r.headers['content-type'])
print(r.content)

Flask_CRUD_demo.py

# pylint: disable=broad-except, invalid-name, redefined-builtin
"""CRUD API demo in Python with Flask.

2019-08-29 https://blog.rapidapi.com/how-to-build-an-api-in-python/ simplified by Cees Timmerman.
2022-05-09 Polished.
"""
import random
from flask import Flask, request


app = Flask(__name__)
app.config["PROPAGATE_EXCEPTIONS"] = True  # https://stackoverflow.com/a/14200265/819417

ai_quotes = {
    0: {
        "author": "Kevin Kelly",
        "quote": "The business plans of the next 10,000 startups are easy to forecast: "
                 "Take X and add AI.",
    },
    1: {
        "author": "Stephen Hawking",
        "quote": "The development of full artificial intelligence could "
                 "spell the end of the human race…. "
                 "It would take off on its own, and re-design "
                 "itself at an ever increasing rate. "
                 "Humans, who are limited by slow biological evolution, "
                 "couldn't compete, and would be superseded.",
    },
    2: {
        "author": "Claude Shannon",
        "quote": "I visualize a time when we will be to robots what "
                 "dogs are to humans, "
                 "and I’m rooting for the machines.",
    },
    3: {
        "author": "Elon Musk",
        "quote": "The pace of progress in artificial intelligence "
                 "(I’m not referring to narrow AI) "
                 "is incredibly fast. Unless you have direct "
                 "exposure to groups like Deepmind, "
                 "you have no idea how fast—it is growing "
                 "at a pace close to exponential. "
                 "The risk of something seriously dangerous "
                 "happening is in the five-year timeframe."
                 "10 years at most.",
    },
    4: {
        "author": "Geoffrey Hinton",
        "quote": "I have always been convinced that the only way "
                 "to get artificial intelligence to work "
                 "is to do the computation in a way similar to the human brain. "
                 "That is the goal I have been pursuing. We are making progress, "
                 "though we still have lots to learn about "
                 "how the brain actually works.",
    },
    5: {
        "author": "Pedro Domingos",
        "quote": "People worry that computers will "
                 "get too smart and take over the world, "
                 "but the real problem is that they're too stupid "
                 "and they've already taken over the world.",
    },
    6: {
        "author": "Alan Turing",
        "quote": "It seems probable that once the machine thinking "
                 "method had started, it would not take long "
                 "to outstrip our feeble powers… "
                 "They would be able to converse "
                 "with each other to sharpen their wits. "
                 "At some stage therefore, we should "
                 "have to expect the machines to take control.",
    },
    7: {
        "author": "Ray Kurzweil",
        "quote": "Artificial intelligence will reach "
                 "human levels by around 2029. "
                 "Follow that out further to, say, 2045, "
                 "we will have multiplied the intelligence, "
                 "the human biological machine intelligence "
                 "of our civilization a billion-fold.",
    },
    8: {
        "author": "Sebastian Thrun",
        "quote": "Nobody phrases it this way, but I think "
                 "that artificial intelligence "
                 "is almost a humanities discipline. It's really an attempt "
                 "to understand human intelligence and human cognition.",
    },
    9: {
        "author": "Andrew Ng",
        "quote": "We're making this analogy that AI is the new electricity."
                 "Electricity transformed industries: agriculture, "
                 "transportation, communication, manufacturing.",
    },
}


@app.route("/ai-quotes/")
@app.route("/ai-quotes/<int:id>")
def read(id=None):
    """Answers to GET request."""
    print(request.method)
    try:
        id = int(id or request.args.get("id"))
    except TypeError:
        id = random.choice(list(ai_quotes.keys()))
    try:
        return ai_quotes[id], 200
    except Exception:
        return "Quote not found", 404


@app.route("/ai-quotes/<int:id>", methods=["POST", "PUT"])
def upsert(id):
    """Update or insert."""
    try:
        quote = ai_quotes[id]
        if request.method == "POST":
            return "Quote with id {id} already exists".format(id=id), 400
        code = 200
    except Exception:
        quote = {}
        ai_quotes[id] = quote
        code = 201

    quote["author"] = request.form["author"]
    quote["quote"] = request.form["quote"]

    return quote, code


@app.route("/ai-quotes/<int:id>", methods=["DELETE"])
def delete(id):
    """Delete quote specified by id."""
    if id in ai_quotes:
        del ai_quotes[id]
    return "Quote with id {id} is deleted.".format(id=id), 200


if __name__ == "__main__":
    app.run(debug=False)