*：'float'和'Decimal'不受支持的操作数类型 [英] unsupported operand type(s) for *: 'float' and 'Decimal'

问题描述

我只是在学习类函数之类的东西，所以我决定创建一个简单的函数，该函数应该给我税额。

I'm just playing around learning classes functions etc, So I decided to create a simple function what should give me tax amount.

到目前为止，这是我的代码。

this is my code so far.

class VAT_calculator:
    """
     A set of methods for VAT calculations.
    """

    def __init__(self, amount=None):
        self.amount = amount
        self.VAT = decimal.Decimal('0.095')

    def initialize(self):
        self.amount = 0

    def total_with_VAT(self):
        """
        Returns amount with VAT added.
        """
        if not self.amount:
            msg = u"Cannot add VAT if no amount is passed!'"
            raise ValidationError(msg)

        return (self.amount * self.VAT).quantize(self.amount, rounding=decimal.ROUND_UP)

我的问题是出现以下错误：

My issue is I'm getting the following error:

不受支持的操作数类型）*：'float'和'Decimal'**

unsupported operand type(s) for *: 'float' and 'Decimal'**

我不明白为什么这不起作用！

I don't see why this should not work!

推荐答案

好像 self.VAT 是十进制十进制类型和 self.amount 是 float ，这是您无法做到的

It seems like self.VAT is of decimal.Decimal type and self.amount is a float, thing that you can't do.

尝试 decimal.Decimal（self.amount）* self.VAT 代替。

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