The code from my article on building RESTful web services with Python and the Flask microframework. See the article here: http://blog.miguelgrinberg.com/post/designing-a-restful-api-with-python-and-flask

rest-server.py

#!flask/bin/python
from flask import Flask, jsonify, abort, request, make_response, url_for
from flask_httpauth import HTTPBasicAuth

app = Flask(__name__, static_url_path = "")
auth = HTTPBasicAuth()

@auth.get_password
def get_password(username):
    if username == 'miguel':
        return 'python'
    return None

@auth.error_handler
def unauthorized():
    return make_response(jsonify( { 'error': 'Unauthorized access' } ), 403)
    # return 403 instead of 401 to prevent browsers from displaying the default auth dialog
    
@app.errorhandler(400)
def bad_request(error):
    return make_response(jsonify( { 'error': 'Bad request' } ), 400)

@app.errorhandler(404)
def not_found(error):
    return make_response(jsonify( { 'error': 'Not found' } ), 404)

tasks = [
    {
        'id': 1,
        'title': u'Buy groceries',
        'description': u'Milk, Cheese, Pizza, Fruit, Tylenol', 
        'done': False
    },
    {
        'id': 2,
        'title': u'Learn Python',
        'description': u'Need to find a good Python tutorial on the web', 
        'done': False
    }
]

def make_public_task(task):
    new_task = {}
    for field in task:
        if field == 'id':
            new_task['uri'] = url_for('get_task', task_id = task['id'], _external = True)
        else:
            new_task[field] = task[field]
    return new_task
    
@app.route('/todo/api/v1.0/tasks', methods = ['GET'])
@auth.login_required
def get_tasks():
    return jsonify( { 'tasks': map(make_public_task, tasks) } )

@app.route('/todo/api/v1.0/tasks/<int:task_id>', methods = ['GET'])
@auth.login_required
def get_task(task_id):
    task = filter(lambda t: t['id'] == task_id, tasks)
    if len(task) == 0:
        abort(404)
    return jsonify( { 'task': make_public_task(task[0]) } )

@app.route('/todo/api/v1.0/tasks', methods = ['POST'])
@auth.login_required
def create_task():
    if not request.json or not 'title' in request.json:
        abort(400)
    task = {
        'id': tasks[-1]['id'] + 1,
        'title': request.json['title'],
        'description': request.json.get('description', ""),
        'done': False
    }
    tasks.append(task)
    return jsonify( { 'task': make_public_task(task) } ), 201

@app.route('/todo/api/v1.0/tasks/<int:task_id>', methods = ['PUT'])
@auth.login_required
def update_task(task_id):
    task = filter(lambda t: t['id'] == task_id, tasks)
    if len(task) == 0:
        abort(404)
    if not request.json:
        abort(400)
    if 'title' in request.json and type(request.json['title']) != unicode:
        abort(400)
    if 'description' in request.json and type(request.json['description']) is not unicode:
        abort(400)
    if 'done' in request.json and type(request.json['done']) is not bool:
        abort(400)
    task[0]['title'] = request.json.get('title', task[0]['title'])
    task[0]['description'] = request.json.get('description', task[0]['description'])
    task[0]['done'] = request.json.get('done', task[0]['done'])
    return jsonify( { 'task': make_public_task(task[0]) } )
    
@app.route('/todo/api/v1.0/tasks/<int:task_id>', methods = ['DELETE'])
@auth.login_required
def delete_task(task_id):
    task = filter(lambda t: t['id'] == task_id, tasks)
    if len(task) == 0:
        abort(404)
    tasks.remove(task[0])
    return jsonify( { 'result': True } )
    
if __name__ == '__main__':
    app.run(debug = True)

@arafatmohammed you are obviously using different code than what I posted here, so I have no way to tell you what's wrong. Try using my code exactly as shown here.

@miguelgrinberg Thnks for ur great job.
I think you'd better rename this function name to sth better as it conflicts with this function name.
I suggest using def bad_request(error) instead.

Awesome step by step tutorial, Thank you miguel.

Thank you. exactly what i needed as a complete beginner

yeah, right guide.

Не работает ваш код, есть ошибка:
if len(task) == 0:
TypeError: object of type 'filter' has no len()
Нужно преобразовать в список и потом проверять пустой ли он

Can you please help me with multiple parallel requests?
I can call many requests at once but only 5 or 6 are processed at a time.

from flask import Flask
import asyncio
app = Flask(__name__, static_url_path = "")

delaycounter=0
@app.route('/delay')
async def test_route():
    global delaycounter
    print(f"start {delaycounter}")
    delaycounter=delaycounter+1
    await asyncio.sleep(5)
    print(f"end{delaycounter}")
    return "ok"
    
if __name__ == '__main__':
    app.run(debug = True, port=8080)