文档声明 x==y 并不意味着 x!=y,这是真的吗?

Docs state that x==y does not imply x!=y, is this true?

如问题所述,python 文档陈述了一条相当矛盾的路线。有问题的行可以在 this page.

上找到

有问题的那一行相当直截了当地说:

"There are no implied relationships among the comparison operators. The truth of x==y does not imply that x!=y is false."

Python 中是否有满足此要求的声明?或者它只限于复杂的陷阱代码。

下面是一个 == 和 != 都为 True 的例子

  class MyClass:
    def __init__(self):
        pass
    def __eq__(self, other):
        return True
    def __ne__(self, other):
        return True

  b1 = MyClass()
  b2 = MyClass()
  print b1 == b2
  print b1 != b2

以上两行都将打印 True