python内置类型的比较顺序

Question

我在寻找一组很好的哨兵值，例如实验：

[] > "sdfasfg" > ()

这似乎有记载：

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. reference

以同样的方式

^{pr2}$

“最大”的内置类型似乎是unicode，我可以用什么作为与unicode类型比较的“正确”哨兵值？这个值比任何unicode字符串都大？在

在Python中，内置类型实例的比较顺序是否定义得很好？在

Answer 1

对任意对象的比较称为“丰富的比较”。有一些文档here，和{a2}。在

如果您使用的是python3，那么检查这个out。相关引述：

Having both the rich comparison methods and the __cmp__() method violates the principle that there should be only one obvious way to do it, so in Python 3 the support for __cmp__() has been removed. For Python 3 you therefore must implement all of the rich comparison operators if you want your objects to be comparable.