python -monkey patching

class Say():
    def sayme(self):
        print("say {}".format(self.name()))
        print("say {}".format(self.what))


class Run():

    def name(self):
        return "monkey"
    Say.name =name
    what = "hello"
    Say.what = what

    def run(self):
        s=Say()
        s.sayme()

r= Run()
r.run()
s=Say()
s.sayme()

-----------
say monkey
say hello
say monkey
say hello

 可以滞后的设置某个类的方法或者属性

而且这种设置是永久的