Question

我正在尝试将一个int和class一起添加，例如1 + Currency（1）我收到错误消息：TypeError：+不支持的操作数类型：“ int”和“ Currency”

如果我使用Currency（1）+ 1，它将正常工作。

是否有某种方法可以将int转换为类对象？还是需要将类转换为int对象？

class Currency:
    "A general currency class"  
    def __init__(self, kr=0, ore=0):
        "Input kr and ore, with default values 0"
        self.ore = round(ore + (kr * 100), 0)
        self.kr = int(self.ore / 100)
        kr_ore = kr + ore / 100

    def __add__(self, other):
        self, other = Currency.__check_type(self, other)
        print(type(self), type(other))

        total = self.ore + other.ore
        self.kr = int(total / 100)
        self.ore = total - self.kr * 100

        return Currency(self.kr, self.ore)

    def __check_type(self, other):
        if type(self) != Currency and type(int) != Currency:
            self = Currency(self)
            other = Currency(other)

        elif type(self) != Currency:
            print("RUNNING")
            self = Currency(self)

        elif type(other) != Currency:
            other = Currency(other)
        return self, other

    __repr__ = __str__

x = 100
y = Currency(1)
print(x+y)

Answer 1

您几乎做到了，如果您打印y+x，它将对您的代码有效。

__add__用于+运算符左侧的对象，右边的dunder方法称为__radd__。

class Currency:
    "A general currency class"

    def __init__(self, kr=0, ore=0):
        "Input kr and ore, with default values 0"

        self.ore = round(ore + (kr * 100), 0)
        self.kr = int(self.ore / 100)
        kr_ore = kr + ore / 100

    def __add__(self, other):
        self, other = Currency.__check_type(self, other)
        print(type(self), type(other))
        total = self.ore + other.ore
        self.kr = int(total / 100)
        self.ore = total - self.kr * 100

    def __radd__(self, other):
        self, other = Currency.__check_type(self, other)
        print(type(self), type(other))
        total = self.ore + other.ore
        self.kr = int(total / 100)
        self.ore = total - self.kr * 100
        return Currency(self.kr, self.ore)

    def __check_type(self, other):
        if type(self) != Currency and type(int) != Currency:
            self = Currency(self)
            other = Currency(other)
        elif type(self) != Currency:
            print("RUNNING")
            self = Currency(self)
        elif type(other) != Currency:
            other = Currency(other)
        return self, other

x = 100
y = Currency(1)
print(x+y)

添加int和Class对象

1 个答案: