how use api in flask code example

Example 1: python flask rest api

from flask import Flask
from flask_restful import Resource, Api

app = Flask(__name__)
api = Api(app)

class HelloWorld(Resource):
    def get(self):
        return {'hello': 'world'}

api.add_resource(HelloWorld, '/')

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

Example 2: creating an apis with python and flask

""" This website does pretty-good explanation with a working example
    
    https://programminghistorian.org/en/lessons/creating-apis-with-python-and-flask
"""