Question

如果我有一个我想编写自定义比较函数的类，有没有办法定义＆＃34;什么＆＃34;被比较而不是单独写出来？

class Version:
    def __init__(self, major, minor, patch):
        self.major = major
        self.minor = minor
        self.patch = patch

    @property
    def version(self):
        return self.major, self.minor, self.patch

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

    def __gt__(self, other):
        return self.version > other.version

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

类似的东西，

class Version:
    def __init__(self, major, minor, patch):
        self.major = major
        self.minor = minor
        self.patch = patch

    def __representation__(self):
        return self.major, self.minor, self.patch

...哪个__representation__会用于所有类似比较的运算符？

Answer 1

我不知道一次定义所有内容的方法。但是python提供了functools.total_ordering装饰器，它要求你只编写__eq__和一个比较魔术方法，然后添加所有其他方法。

示例：

@total_ordering
class Version:
    def __init__(self, major, minor, patch):
        self.major = major
        self.minor = minor
        self.patch = patch

    @property
    def version(self):
        return self.major, self.minor, self.patch

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

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

用于默认比较表示的Python魔术方法？

1 个答案: