python使用UnboundMethodType修改类方法

from types import UnboundMethodType

class class1(object):
    def fun1(self):
        print 'fun1'

oldfun1 = class1.fun1

def fun1new(self):
    print 'fun1new'
    return oldfun1(self)

class1.fun1 = UnboundMethodType(fun1new, None, class1)

class1().fun1()

最终输出

fun1new
fun1