Python hasattr,getattr,setattr,delattr

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 # 作者:Presley
 # 邮箱:1209989516@qq.com
 # 时间:2018-11-04
 # 反射使用
 import sys
 class WebServer(object):
     def __init__(self,host,port):
         self.host = host
         self.port = port
     def start(self):
         print("Server is starting...")
     def stop(self):
         print("Server is stopping...")
     def restart(self):
         self.stop()
         self.start()

 def test_run(ins,name):
     print("running...",name,ins.host)

 if __name__ == "__main__":
     server = WebServer("localhost",333)
     '''#方法1
     # #print(sys.argv[1])
     # cmd_dic = {
     #     "start":server.start,
     #     "stop":server.stop
     # }
     # if sys.argv[1] in cmd_dic:
     #     cmd_dic[sys.argv[1]]()'''

 #1、hasattr,getattr
     #方法二
     if hasattr(server,sys.argv[1]):
         func = getattr(server,sys.argv[1]) #获取server.start方法的内存地址
         func() #相当于server.start()

 #2、setattr
     '''
     setattr(server,"run",test_run) #给实例绑定一个test_run方法,方法名字叫run
     server.run(server,"wohaoshuai")#绑定的方法调用类中属性需要传入对象名称
     '''
 #3、delattr
     delattr(WebServer,"start")
     server.restart()#报错