小编def*_*nce的帖子

我想修补一个单一的类方法,保持旧的功能.考虑一下我的代码来获取想法.这是我的代码(非常合成的例子).

#!/usr/bin/env python

class A:

  @classmethod
  def foo(kls, param):
    print 'A.foo called, param is ' + param

  def bar(self, param):
    print 'A.bar called, param is ' + param


a = A()
a.foo('param_foo')
a.bar('param_bar')

# Patching things

def bar_wrapper(wrapped_func):
  def _w(*args, **kwargs):
    print '<bar_wrap>'
    wrapped_func(*args, **kwargs)
    print '</bar_wrap>'
  return _w

def foo_wrapper(wrapped_func):
  # Something missing here?
  def _w(*args, **kwargs):
    print '<foo_wrap>'
    wrapped_func(*args, **kwargs)
    print '</foo_wrap>'
  return _w

# Everything is pretty ok
A.bar = bar_wrapper(A.bar)
a.bar('is_is_wrapped?')

# Failed to wrap @classmethod …