反射

import sys
class Nginx(object):
    def __init__(self,name): 
        self.name=name
    def start(self):
        print('%s server is starting...' %self.name)
    def stop(self):
        print('%s server  stop...' %self.name)
    def restart(self):
        self.stop()
        self.start()
def myaction(name):
　　print("%s server status" %name)
def __name__=='__main__':
     server=Nginx('nginx')
    if hasattr(server,sys.argv[1]):
            action=getattr(server,sys.argv[1])
            action()
　　 setattr(server,'action',myaction)
  　 server.action('nginx')
　　 delattr(server,'action')
　　 delattr(server,'name')
　　　delattr(Nginx,'restart')