python - 在 Python 中，None 的计算结果小于零？

Question

这个问题在这里已经有了答案:

Is everything greater than None? (2 个回答)

关闭 9年前。

在 Python 中，None 的计算结果小于零？

ActivePython 2.7.2.5 (ActiveState Software Inc.) based on
Python 2.7.2 (default, Jun 24 2011, 12:21:10) [MSC v.1500 32 bit (Intel)] on win
32
Type "help", "copyright", "credits" or "license" for more information.
>>> None < 0
True
>>> None == 0
False
>>> None > 0
False
>>>

这是预期的吗？

我会猜到 None 要么等于零(通过类型强制)，要么所有这些语句都会返回 False。

Answer 1

见 the manual :

Objects of different types, except different numeric types and different string types, never compare equal; such objects are ordered consistently but arbitrarily (so that sorting a heterogeneous array yields a consistent result).

和

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.