test.py

def decorator(decorator):
    def decorate(func):
        def decorated(*args, **kw):
            return decorator(func, *args, **kw)
        return decorated
    return decorate

@decorator
def decor1(func, *args, **kw):
    print "before1"
    r = func(*args, **kw)
    print "after1"
    return r

@decorator
def decor2(func, self, a, b):
    print "before2: a=%s, b=%s" % (a, b)
    r = func(self, a, b=b)
    print "after2"
    return r

@decor1  
def simple(x):
    return x + 1
  
class Foo:
  
  @decor2
  @decor1
  def bar(self, a, b):
    self.x = b
    print "a = %s, b = %s" % (a, b)
    
def main():
  f = Foo()
  f.bar(42, simple(12))
    
if __name__ == '__main__':
  main()