Python 2 中比较类型有什么作用？

Question

考虑这段代码：

class class1:
    pass

class class2:
    pass

class1 > class2

在 Python 3 中，我（正确地）收到此错误

TypeError: '>' not supported between instances of 'type' and 'type'

Python 2 发生了什么？

>>> class1 > class2
False
>>> class2 > class1
True
>>>

Answer 1

正如@user2864740 在评论中所说：

在Python 3、根据documentation,

The <, <=, > and >= operators will raise a TypeError exception when any operand is a complex number, the objects are of different types that cannot be compared, or other cases where there is no defined ordering.

在Python2,

The <, <=, > and >= operators will raise a TypeError exception when any operand is a complex number. CPython implementation detail: Objects of different types except numbers are ordered by their type names; objects of the same types that don’t support proper comparison are ordered by their address.

因为class都是同一类型（types.ClassType），class1 < class2将取决于两个class对象的内存地址恰好是什么。

Python 2 中比较类型有什么作用？

What does comparing types do in Python 2?

python-2.x