flask livereload usage

#coding=utf-8

from flask import Flask
from flask_script import Manager


app = Flask(__name__)

manager = Manager(app)

@app.route("/")
def upload():
    return "hello nihao"

@manager.command
def dev():
    from livereload import Server
    live_server = Server(app.wsgi_app)
    live_server.watch("**/*.*")
    live_server.serve(open_url=True)


if __name__ == "__main__":
    manager.run()

#python main.py dev