#!/usr/local/bin/python # coding=utf-8 from flask import Flask app = Flask(__name__) @app.route('/') def hello_world(): return 'Hello World!' if __name__ == '__main__': app.run(host='0.0.0.0',port=9000) 第4行,引入Flask类,Flask类实现了一个WSGI应用第5行,app是Flask的实例,