On Nov 5, 2015, at 1:28 AM, Wang Yan <snailcoder@163.com> wrote:

Thank you to remind me of Klein. I'm very new to Twisted and Klein. What I've known is that Klein is a little like Flask, with which I can implement a UserAPI as follows:
   
    from flask import Flask
    from flask.ext.restful import Api, Resource

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

    class UserAPI(Resource):
        def get(self, user_id):
            pass

        def post(self, user_id):
            pass

    api.add_resource(UserAPI, '/users/<int:id>', endpoint='user')

Is there any similar usage in Klein?

Yes; in fact this extension for Flask is similar to how twisted.web works internally.  I think you're looking for something like this:

from klein import run, route

from twisted.web.resource import Resource

class User(Resource, object):

    def __init__(self, user_id):

        super(User, self).__init__()

        self.user_id = user_id

    def render_GET(self, request):

        pass

    def render_POST(self, request):

        pass

@route("/users/<int:user_id>")

def user(request, user_id):

    return User(user_id)

run("localhost", 8080)