给定对方法的引用，是否有办法检查该方法是否绑定到对象？我们还可以访问绑定到的实例吗？

解决方案

回答

im_self属性(仅Python 2)

回答

def isbound(method):
    return method.im_self is not None

def instance(bounded_method):
    return bounded_method.im_self

用户定义的方法：

When a user-defined method object is
  created by retrieving a user-defined
  function object from a class, its
  im_self attribute is None and the
  method object is said to be unbound.
  When one is created by retrieving a
  user-defined function object from a
  class via one of its instances, its
  im_self attribute is the instance, and
  the method object is said to be bound.
  In either case, the new method's
  im_class attribute is the class from
  which the retrieval takes place, and
  its im_func attribute is the original
  function object.

在Python 2.6和3.0中：

Instance method objects have new
  attributes for the object and function
  comprising the method; the new synonym
  for im_self is __self__, and im_func
  is also available as __func__. The old
  names are still supported in Python
  2.6, but are gone in 3.0.