Initializing the application

To create our simple RESTful API, we will create a single file and use SQLite3 as a database:

1. Create a folder named server and create a file named app.py in it:

import sqlite3 as sql
from flask import Flask
from flask_restful import Resource, Api, reqparse
from flask_cors import CORS

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

parser = reqparse.RequestParser()

conn = sql.connect('tasks.db')
conn.execute('CREATE TABLE IF NOT EXISTS tasks (id INTEGER PRIMARY 
   KEY AUTOINCREMENT, task TEXT)')
conn.close()

2. Then, we will create our ToDo class, and on the constructor of the class, we will connect to the database and select all tasks:
   

class ToDo(Resource):
    def get(self):
        con = sql.connect('tasks.db')
        cur = con.cursor()
        cur.execute('SELECT * from tasks')
        tasks = cur.fetchall()
        con.close()

        return {
            'tasks': tasks
        }

3. To implement the RESTful POST method, create...