与python 3.1文档相反,hash(obj)!= ID(OBJ)。那么哪个是正确的呢?

下面是来自python v3.1.2文档的内容:

从python语言参考第3.3.1节基本定制:

object.__hash__(self)

... User-defined classes have __eq__() and __hash__() methods 
by default; with them, all objects compare unequal (except
with themselves) and x.__hash__() returns id(x).

从术语表:

hashable

... Objects which are instances of user-defined classes are 
hashable by default; they all compare unequal, and their hash 
value is their id().

这是通过版本2.6.5实现的:

Python 2.6.5 (r265:79096, Mar 19 2010 21:48:26) ...
...
>>> class C(object): pass
...
>>> c = C()
>>> id(c)
11335856
>>> hash(c)
11335856

但在3.1.2版中:

Python 3.1.2 (r312:79149, Mar 21 2010, 00:41:52) ...
...
>>> class C: pass
...
>>> c = C()
>>> id(c)
11893680
>>> hash(c)
743355

那是哪一个呢?我应该报告文档错误还是程序错误? 如果是文档错误,那么 hash() 用户的值 类实例不再与 id() 价值,那就是 有意思的是知道它是什么或者它是如何计算的,以及它为什么是 在版本3中更改。