#!/usr/bin/env python

class wrap(object):
  def wrap(self, func, premethod=None, postmethod=None, preargs={}, postargs={}):
    def x(function, *args, **kwds):
      if premethod:
        premethod(*args, **kwds)
      function(*args, **kwds)
      if postmethod:
        postmethod(*args, **kwds)
    return lambda *x,**k: x(func,*x,**k)
  wrap = classmethod(wrap)

def pre(self, *args, **kwds):
  print "PRE: %s, %s" % (args, kwds)

def post(self, *args, **kwds):
  print "PRE: %s, %s" % (args, kwds)

class X(object):
  def Foo(self, *args, **kwds):
    try:
      print kwds['somearg']
    except:
      print "No 'somearg' argument given"

  Foo = wrap.wrap(Foo, pre, post)


x = X()

x.Foo(42, bar=33)
x.Foo(somearg="Hello there")