from flask import Flask

app = Flask(__name__,static_url_path='/xx')

@app.route('/index')

def index():

    return 'hello world

def route(self, rule, **options):

    def decorator(f):

        endpoint = options.pop("endpoint", None)

        self.add_url_rule(rule, endpoint, f, **options)

        return f

    return decorator

def add_url_rule(

    self,

    rule,

    endpoint=None,

    view_func=None,

    provide_automatic_options=None,

    **options

):

    if endpoint is None:

        endpoint = _endpoint_from_view_func(view_func)

        options["endpoint"] = endpoint

        methods = options.pop("methods", None)

        if methods is None:

            methods = getattr(view_func, "methods", None) or ("GET",)

            rule = self.url_rule_class(rule, methods=methods, **options)

            self.url_map.add(rule)

            if view_func is not None:

                self.view_functions[endpoint] = view_func