python 知识点

#/usr/bin/env python
# -*- coding:utf-8 -*-
import sys
class webserver(object):
    def __init__(self,host,port):
        self.host = host
        self.port = port

    def start(self):
        print(‘server %s is starting‘%self.host)

    def stop(self):
        print(‘server %s is stoping‘%self.host)

    def restart(self):
        self.start()
        self.stop()

if __name__ == "__main__":
    server = webserver(‘localhost‘,‘333‘)
    if hasattr(server,sys.argv[1]): #判断参数是否在实例中
        func = getattr(server,sys.argv[1])#获取实例的内存地址
        func()#执行实例的方法可以传参数