pip install Flask-RESTful

from flask import Flask

from flask_restful import Api, Resource, reqparse, abort

app = Flask(__name__)

api = Api(app)

USER_LIST = {

    : {'name':'Michael'},

    : {'name':'Tom'},

}

parser = reqparse.RequestParser()

parser.add_argument('name', type=str)

def abort_if_not_exist(user_id):

    if user_id not in USER_LIST:

        abort(, message="User {} doesn't exist".format(user_id))

class User(Resource):

    def get(self, user_id):

        abort_if_not_exist(user_id)

        return USER_LIST[user_id]

    def delete(self, user_id):

        abort_if_not_exist(user_id)

        del USER_LIST[user_id]

        return '', 

    def put(self, user_id):

        args = parser.parse_args(strict=True)

        USER_LIST[user_id] = {'name': args['name']}

        return USER_LIST[user_id], 

class UserList(Resource):

    def get(self):

        return USER_LIST

    def post(self):

        args = parser.parse_args(strict=True)

        user_id = int(max(USER_LIST.keys())) +

        USER_LIST[user_id] = {'name': args['name']}

        return USER_LIST[user_id], 

api.add_resource(UserList, '/users')

api.add_resource(User, '/users/<int:user_id>')

if __name__ == '__main__':

    app.run(host='127.0.0.1', debug=True)