在the manual说：

in general,__lt__() and __eq__() are sufficient,if you want the
conventional meanings of the comparison operators

但我看到了错误：

>       assert 2 < three
E       TypeError: unorderable types: int() < IntVar()

当我运行此测试时：

from unittest import TestCase

class IntVar(object):

    def __init__(self,value=None):
        if value is not None: value = int(value)
        self.value = value

    def __int__(self):
        return self.value

    def __lt__(self,other):
        return self.value < other

    def __eq__(self,other):
        return self.value == other

    def __hash__(self):
        return hash(self.value)

class DynamicTest(TestCase):

    def test_lt(self):
        three = IntVar(3)
        assert three < 4
        assert 2 < three
        assert 3 == three

我很惊讶当IntVar()在右边时,没有调用__int __().我究竟做错了什么？

添加__gt __()修复此问题,但意味着我不明白订购的最低要求是什么…

谢谢,
安德鲁