@function_wrapper
  def function():
    pass

  def function():
    pass

  function = function_wrapper(function)

def function_wrapper(wrapped):
    def _wrapper(*args, **kwargs):
      return wrapped(*args, **kwargs)
    return _wrapper 

  @function_wrapper
  def function():
    pass

  class function_wrapper(object):
    def __init__(self, wrapped):
      self.wrapped = wrapped
    def __call__(self, *args, **kwargs):
      return self.wrapped(*args, **kwargs)

  @function_wrapper
  def function():
    pass

 def function_wrapper(wrapped):
    def _wrapper(*args, **kwargs):
      return wrapped(*args, **kwargs)
    return _wrapper 

  @function_wrapper
  def function():
    pass 

  >>> print(function.__name__)
  _wrapper

  import functools 

  def function_wrapper(wrapped):
    @functools.wraps(wrapped)
    def _wrapper(*args, **kwargs):
      return wrapped(*args, **kwargs)
    return _wrapper 

  @function_wrapper
  def function():
    pass 

  >>> print(function.__name__)
  function

  import inspect 

  def function_wrapper(wrapped): ...

  @function_wrapper
  def function(arg1, arg2): pass 

  >>> print(inspect.getargspec(function))
  ArgSpec(args=[], varargs='args', keywords='kwargs', defaults=None)

  >>> print(inspect.getsource(function))
    @functools.wraps(wrapped)
    def _wrapper(*args, **kwargs):
      return wrapped(*args, **kwargs)

 class Class(object):
    @function_wrapper
    @classmethod
    def cmethod(cls):
      pass 

  Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
   File "<stdin>", line 3, in Class
   File "<stdin>", line 2, in wrapper
   File ".../functools.py", line 33, in update_wrapper
    setattr(wrapper, attr, getattr(wrapped, attr))
  AttributeError: 'classmethod' object has no attribute '__module__'

class Class(object):
    @function_wrapper
    @classmethod
    def cmethod(cls):
      pass 

  >>> Class.cmethod() 
  Traceback (most recent call last):
   File "classmethod.py", line 15, in <module>
    Class.cmethod()
   File "classmethod.py", line 6, in _wrapper
    return wrapped(*args, **kwargs)
  TypeError: 'classmethod' object is not callable